Prisma poema: POEMA PRISMA — Manuel Maples Arce
Prisma . Comentariosdelibros.com
A veces, una misma realidad se muestra de dos maneras totalmente distintas, dependiendo de quin la est mirando y de la manera en la que es observada.
Algo as ocurre con «Prisma». El autor nos habla en sus poemas sobre la vida, sobre sus experiencias, sobre el amor y el desamor, sobre su peculiar visin del mundo que le rodea. Plasma en cada verso emociones que todos hemos sentido alguna vez, pero sabe darles ese toque especial que consigue hacernos pensar y ver sus escritos como algo nuevo y diferente.
El libro se divide en diferentes bloques temticos: ELLA, ELLOS, L, AQUEL e INCERTEZAS. En cada uno de ellos se nos muestran poemas intimistas, complejos, cargados de rabia contenida en metforas y alusiones histricas.
ELLA contiene amor, pero sobre todo amor roto. Habla de la mujer, del dolor, de la angustia y sus recuerdos, donde el autor parece ensaarse contra su suerte y se lamenta por su corazn malherido. Lejos de mostrarse dbil y desolado, sus poemas nos dejan un sabor de boca amargo, pero nos muestran su lado ms fuerte y luchador. Un ejemplo de ello se observa en estos versos de No es ms que nada: Yo te pido, con el corazn, con mi piel lo que soy /que cuando cierres los ojos en tu clido lecho /aprietes las sbanas y sientas rabia y dolor /por no tenerme a m entre tus brazos.
En ELLOS encontramos ms intimismo por parte del autor si cabe, ms alusiones a su rabia interior y a ese dolor que le consume por dentro. Nos habla del mundo, de la sociedad, y se muestra tal y cmo es, dejndonos entrar en su mente y conocindole un poquito ms. Hallamos en estos versos algo de miedo, temor por el paso del tiempo, de la vida, de lo diferentes que son las cosas cuando se alcanza cierta madurez fsica y mental.
L contina la lnea del paso del tiempo y de lo efmero, y en l encontramos poemas como el hijo del viento, el hijo del hierro o el hijo del tiempo, donde hace un repaso hermoso y emotivo sobre su vida, y el autor nos confiesa haber vuelto a la vida tras encontrar a su amada.
AQUEL esconde sentimientos religiosos, la visin del autor sobre el ms all y sobre Dios. No digas una palabra, /que las palabras son nuestras. /Haz, simplemente, con tu belleza, /para que mis ojos puedan soportarlo.
INCERTEZAS, quiz el bloque ms corto del libro (pero no por ello menos denso), habla del amor otra vez. Y de cmo se puede y se debe salir de aquel amor que hace dao… De querer y no poder, de desear y no sucumbir al deseo. Todava soy libre, lo logr, /muero por besarte ahora. /Por tocarte, porque me toques, /depende de m, de m depende.
En definitiva, «Prisma» es una obra compleja y cargada de emociones, de sentimientos, de ideas contrapuestas, de rabia, de amor y de ira reprimida. Pero por encima de todo est la humanidad, esa sinceridad con la que el autor parece entregarse plenamente a sus versos y con la que podemos hallar, escondida entre estrofa y estrofa, la verdadera esencia del hombre.
Prismapoema de amorpostal
Prismapoema de amorpostal



Prisma
Gotas cristalinas haciendo un ro, 9604 C frogui

Poemas
Poetry

Read online Prism.
Poetry collection”, Larisa Paising – LitRes
Beam of life with a bright flash of light
Refracted through the edges of my prism,
Transforming the rainbow spectrum
In colorful thoughts, like aphorisms
Larisa Paising
Illustrator Maria Naimushina
© Larisa Paising, 2020
© Maria Naimushina, Illustrations, 2020
ISBN 9785447413354
created in the intellectual publishing system Ridero
On book
Poetic collection «Prism» these interesting poems on various subjects: about nature, Motherland, space, death, life, dreams, mysticism, love, erotica
comprehend the meaning of life and the universe, see the beautiful and mysterious in everything, call for mercy and respect for others. nine0005
Each poem is a riddle, a whole story, written by an inspired hand and polished by time.
Some works can be called a spiritual medicine that strengthens vitality. Particular attention will be drawn to the «formula of perfection» presented by the author in the book.
«PRISMA» will take the reader to the confusing, paradoxical and fascinating country of the author’s work, will allow you to look at life differently, to feel the «prism effect», that is, to see the multicolored spectrum into which the whole world is split. nine0005
Poems
Perfection formula
Nature touches and children’s laughter,
I think clearly, keeping calm.
When I believe in myself, success is possible,
The world of art is my pleasure.I show mercy to everyone.
Harmony reinforces health,
I bring goodness and forgive everything,
The heart beats like a melody.The food I eat, I bless,
I drink water as my favorite drink.
I am God’s creation, I contemplate it,
I repent of sin, I pray for indulgence.Every day I comprehend God’s law,
I feel bliss in love.
I am endowed with an immortal spirit,
In the image of perfection itself.
True…
Ahead — the path to infinity,
Behind — the moon, forests, cities.
Stars and eternity above me,
The road to truth is so far away.
Star Carnival
How romantic at the Star Ball
The blueeyed Earth waltzes,
Dances with her without removing her veil
Companion is the goldenhaired Moon.At the masquerade merrily plays
The sun plays a funny game:
Now hides, now blinds —
Do not catch the mischievous star.Circling in the masks of the planet,
Hiding their faces for millions of years,
Smoldering, serve the star of the comet,
Minuet in the courtyard of the galaxy.
Hermit
In harmony with wildlife
The hermit meets the dawn early,
Lonely, but with complete freedom
Anchorite meditates on wisdom.
Constellation Sagittarius
Burns brighter and brighter than all
Always in the constellation Sagittarius
One of a thousand lights —
Your lucky star.
Portrait
Weak contour depicts
Beautiful girl’s face.
Such tender and sweet features
Reflected on a white canvas.An affectionate look beckons to itself,
Eyes speak to me of innocence.
An immaculate image has long been sketched,
I would like to know the exact appearance of a stranger.Madly in love with her portrait,
Captivated by riddles and secrets.
Who is she? And where is now?
Perhaps the years separate us.
“I walk barefoot over sharp stones…”
I walk barefoot over sharp stones,
My feet are shackled.
I will be able to pass the test and this,
I will overcome all difficult roads. nine0079Boldly in life, not easy delirium,
I become stronger from torture.
I’ll break the iron chains like a thread,
Even if the wounds become more painful.
DevaRussia
There is no more beautiful Virgin in the world,
By name — Native Rus’,
She is special on the planet,
I am proud of her incomparability.Church domes shine overhead —
Elegance of unearthly beauty.
Russian spit — like dense forests,
Dark groves — labyrinths of the soul. nine0079A kind smile is charm itself,
Dresses made of snow, flowering meadows.
Striking with the brilliance of talent,
Drawing wisdom from the depths of centuries.Always in harmony with nature,
A bit harsh in frosty winter,
The season changes her mood:
Sad in autumn, passionate in spring.Extremely industrious and generous,
The expanses of her state are free,
Full of hospitality, care,
But wasteful with her wealth. nine0079Contradictory, daring nature,
Greatness and simplicity in her eyes,
Inheritance — original culture,
Banner in hand, prayer on lips.Invincible, exhausted, but rebellious,
Patriotism is hardened in the blood of Rus’,
Tears and pain proudly hides,
Weak disposition, but the highest heroism.The country lives out of time,
The guardian angel protects the Virgin,
Faithfully and truthfully, the girl is red,
The Orthodox church is her healer.She was a peasant woman and a queen,
She was able to gain honor with freedom.
To be Rus»s mighty empress
Reflecting the greatness of the doubleheaded eagle!
Define a prism. Regular square prism
Prism
is a polyhedron whose two faces are equal ngons (bases)
lying in parallel planes, and the remaining n faces are parallelograms (side faces)
nine0005
. Side rib
of a prism is the side of the side face that does not belong to the base.
A prism whose lateral edges are perpendicular to the base planes is called straight
prism (Fig. 1). If the side ribs are not perpendicular to the planes of the bases, then the prism is called oblique
. correct
A prism is a straight prism whose bases are regular polygons. nine0006
Height
prism is called the distance between the planes of the bases. Diagonal
a prism is a segment connecting two vertices that do not belong to the same face. Diagonal
is a section of a prism by a plane passing through two side edges that do not belong to the same face. Perpendicular section
is a section of a prism by a plane perpendicular to the side edge of the prism. nine0006
Side surface area
prism is called the sum of the areas of all side faces. Full surface area
is the sum of the areas of all the faces of the prism (i.e. the sum of the areas of the side faces and the areas of the bases).
For an arbitrary prism, the formulas are correct
:
where l
— length of the side rib;
H
— height;
P
Q
S side
S full
S main
— base area;
V
is the volume of the prism.
For a straight prism, the formulas are correct:
where p
— base perimeter;
l
— length of the side rib;
H
— height.
Parallelepiped
is called a prism, the base of which is a parallelogram. A parallelepiped whose lateral edges are perpendicular to the bases is called straight
(Fig. 2). If the side edges are not perpendicular to the bases, then the parallelepiped is called oblique
. A right parallelepiped whose base is a rectangle is called rectangular.
A rectangular parallelepiped with all edges equal is called a cube.
Faces of a parallelepiped that do not have common vertices are called opposite faces
nine0025 . The lengths of edges coming from one vertex are called dimensions
box. Since the box is a prism, its main elements are defined in the same way as they are defined for prisms.
Theorems.
1. The diagonals of the parallelepiped intersect at one point and bisect it.
2. In a cuboid, the square of the length of a diagonal is equal to the sum of the squares of its three dimensions:
3. All four diagonals of a cuboid are equal to each other. nine0006
For an arbitrary parallelepiped, the following formulas are true:
where l
— length of the side rib;
H
— height;
P
— perimeter of a perpendicular section;
Q
— Area of a perpendicular section;
S side
– side surface area;
S full
— total surface area;
S main
— base area; nine0006
V
is the volume of the prism.
For a right parallelepiped, the following formulas are true:
where p
— base perimeter;
l
— length of the side rib;
H
is the height of a straight parallelepiped.
(3)
where p
— base perimeter;
H
— height;
d
nine0005 — diagonal;
a,b,c
— measurements of a box.
The formulas for the cube are:
where a
— rib length;
d
is the diagonal of the cube.
Example 1.
The diagonal of a cuboid is 33 dm, and its measurements are related as 2:6:9. Find the measurements of the cuboid.
Solution.
To find the dimensions of the parallelepiped, we use formula (3), i.e. the fact that the square of the hypotenuse of a cuboid is equal to the sum of the squares of its dimensions. Denote by k
Proportional factor. Then the dimensions of the parallelepiped will be equal to 2 k
, 6 k
and 9 k
. We write formula (3) for the problem data:
Solving this equation for k
, we get:
So the dimensions of the box are 6 dm, 18 dm and 27 dm.
Answer:
6 in., 18 in., 27 in.
Example 2.
Find the volume of an inclined triangular prism whose base is an equilateral triangle with a side of 8 cm, if the lateral edge is equal to the side of the base and is inclined at an angle of 60º to the base. nine0006
Solution
.
Let’s make a drawing (Fig. 3).
In order to find the volume of an inclined prism, you need to know its base area and height. The area of the base of this prism is the area of an equilateral triangle with a side of 8 cm. Let’s calculate it:
The height of the prism is the distance between its bases. From top A
1 lower base perpendicular to the plane of the lower base A
nine0005 1 D
. Its length will be the height of the prism. Consider D A
1 AD
: since this is the angle of inclination of the side rib A
1 A
to base plane, A
1 A
\u003d 8 cm. From this triangle we find A
1 D
:
Now we calculate the volume using the formula (1):
Answer:
192 cm3.
Example 3.
The side edge of a regular hexagonal prism is 14 cm. The area of the largest diagonal section is 168 cm 2 . Find the total surface area of the prism. nine0006
Solution.
Let’s make a drawing (Fig. 4)
The largest diagonal section is a rectangle AA
1 DD
1 as diagonal AD
regular hexagon ABCDEF
is the largest. In order to calculate the lateral surface area of a prism, it is necessary to know the side of the base and the length of the lateral rib.
Knowing the area of the diagonal section (rectangle), we find the diagonal of the base.
Since then
Since then AB
=6 cm.
Example 4.
The base of a right parallelepiped is a rhombus. The areas of diagonal sections are 300 cm 2 and 875 cm 2. Find the area of the side surface of the parallelepiped. nine0006
Solution.
Let’s make a drawing (Fig. 5).
Denote the side of the rhombus through a
, diagonal rhombus d
1 and d
2 , box height h
. To find the lateral surface area of a straight parallelepiped, it is necessary to multiply the perimeter of the base by the height: (formula (2)). Base perimeter p = AB + BC + CD + DA = 4AB = 4a
since ABCD
— rhombus. H = AA
1 = h
nine0005 . That. Need to find a
and h
.
Consider diagonal sections. AA
1 SS
1 — a rectangle, one side of which is the diagonal of a rhombus AC
= d
1 , second side rib AA
1 = h
, then
Similarly for section BB
1 DD
1 we get:
Using the property of a parallelogram such that the sum of the squares of the diagonals is equal to the sum of the squares of all its sides, we get the equality We get the following. nine0006
Polyhedra
The main object of study of stereometry are threedimensional bodies. Body
is a part of space bounded by some surface.
Polygon
is a body whose surface consists of a finite number of flat polygons. A polyhedron is called convex if it lies on one side of the plane of every flat polygon on its surface. The common part of such a plane and the surface of a polyhedron is called facet
. The faces of a convex polyhedron are flat convex polygons. The sides of the faces are called edges of the polyhedron
, and the vertices are vertices of the polyhedron
.
For example, a cube consists of six squares that are its faces. It contains 12 edges (sides of squares) and 8 vertices (vertices of squares).
The simplest polyhedra are prisms and pyramids, which we will study further.
Prism
Definition and properties of a prism
Prism
is a polyhedron consisting of two flat polygons lying in parallel planes combined by parallel translation, and all segments connecting the corresponding points of these polygons. Polygons are called bases of a prism
, and the segments connecting the corresponding vertices of the polygons are by the side edges of the prism
.
Prism height
nine0005 is the distance between the planes of its bases (). A segment connecting two vertices of a prism that do not belong to the same face is called the diagonal of the prism
(). The prism is called nangle
if its base is an ngon.
Any prism has the following properties, which follow from the fact that the bases of the prism are combined by parallel translation:
1. The bases of the prism are equal.
2. Side ribs of the prism are parallel and equal. nine0006
Prism surface consists of bases and side surfaces
. The lateral surface of the prism consists of parallelograms (this follows from the properties of the prism). The area of the lateral surface of a prism is the sum of the areas of the lateral faces.
Straight prism
Prism called straight
if its side edges are perpendicular to the bases. Otherwise the prism is called oblique
.
The faces of a straight prism are rectangles. The height of a straight prism is equal to its side faces. nine0006
Full surface prism
is the sum of the lateral surface area and the areas of the bases.
Straight prism
is called a straight prism with a regular polygon at the base.
Theorem 13.1
. The area of the lateral surface of a straight prism is equal to the product of the perimeter and the height of the prism (or, equivalently, to the lateral edge).
Proof. The side faces of a straight prism are rectangles whose bases are the sides of the polygons at the bases of the prism, and the heights are the side edges of the prism. Then by definition the lateral surface area is:
,
where is the perimeter of the base of a straight prism.
Parallelepiped
If parallelograms lie at the bases of a prism, then it is called a parallelepiped
. All the faces of a parallelepiped are parallelograms. In this case, the opposite faces of the parallelepiped are parallel and equal.
Theorem 13.2
. The diagonals of the parallelepiped intersect at one point and the intersection point is divided in half.
Proof. Consider two arbitrary diagonals, for example, and . Because the faces of the parallelepiped are parallelograms, then and , which means that according to T about two straight lines parallel to the third . In addition, this means that the lines and lie in the same plane (the plane). This plane intersects parallel planes and along parallel lines and . Thus, a quadrilateral is a parallelogram, and by the property of a parallelogram, its diagonals and intersect and the intersection point is divided in half, which was to be proved. nine0006
A cuboid whose base is a rectangle is called a cuboid
. All faces of a cuboid are rectangles. The lengths of nonparallel edges of a rectangular parallelepiped are called its linear dimensions (measurements). There are three sizes (width, height, length).
Theorem 13.3
. In a rectangular parallelepiped, the square of any diagonal is equal to the sum of the squares of its three dimensions (proved by applying Pythagoras’ T twice). nine0006
A rectangular box with all edges equal is called a cube
.
Tasks
13.1 How many diagonals does n have
gonal prism
13.2 In an oblique triangular prism, the distances between the side edges are 37, 13, and 40. Find the distance between the larger side face and the opposite side edge.
13.3 Through the side of the lower base of a regular triangular prism, a plane is drawn that intersects the side faces along segments, the angle between which is . Find the angle of inclination of this plane to the base of the prism. nine0006
Lecture:
Prism, its bases, lateral edges, height, lateral surface; straight prism; right prism
Prism
If you have learned plane figures from the previous questions together with us, then you are completely ready to study threedimensional figures. The first solid that we will learn will be a prism.
Prism
is a threedimensional body that has a large number of faces.
This figure has two polygons at the bases, which are located in parallel planes, and all side faces are in the form of a parallelogram. nine0006
Figure 1. Figure. 2
So, let’s see what a prism consists of. To do this, pay attention to Fig.1
As mentioned earlier, the prism has two bases that are parallel to each other — these are the pentagons ABCEF and GMNJK. Moreover, these polygons are equal to each other.
All other faces of the prism are called side faces — they consist of parallelograms. For example, BMNC, AGKF, FKJE, etc.
The total surface of all side faces is called side surface
.
Each pair of adjacent faces has a common side. Such a common side is called an edge. For example, MB, CE, AB, etc.
If the upper and lower bases of the prism are connected by a perpendicular, then it will be called the height of the prism. In the figure, the height is marked as a straight line OO 1.
There are two main types of prisms: oblique and straight.
If the side edges of the prism are not perpendicular to the bases, then such a prism is called oblique
.
If all the edges of the prism are perpendicular to the bases, then such a prism is called straight
.
If the bases of a prism are regular polygons (those whose sides are equal), then such a prism is called regular
.
If the bases of the prism are not parallel to each other, then such a prism will be called truncated.
You can see it in Fig.2
Formulas for finding the volume, area of a prism
There are three basic formulas for finding volume. They differ from each other in application:
Similar formulas for finding the surface area of a prism:
Different prisms are not similar to each other. At the same time, they have a lot in common. To find the area of \u200b\u200bthe base of a prism, you need to figure out what kind it looks like.
General theory
A prism is any polyhedron whose sides are parallelogramshaped. Moreover, any polyhedron can be at its base — from a triangle to an ngon. Moreover, the bases of the prism are always equal to each other. What does not apply to the side faces — they can vary significantly in size. nine0006
When solving problems, it is not only the area of the base of the prism that is encountered. It may be necessary to know the lateral surface, that is, all faces that are not bases. The full surface will already be the union of all the faces that make up the prism.
Sometimes height appears in problems. It is perpendicular to the bases. The diagonal of a polyhedron is a segment that connects in pairs any two vertices that do not belong to the same face.
It should be noted that the area of the base of a straight or inclined prism does not depend on the angle between them and the side faces. If they have the same figures in the upper and lower faces, then their areas will be equal. nine0006
Triangular prism
It has at its base a figure that has three vertices, that is, a triangle. It is known to be different. If then it is enough to recall that its area is determined by half the product of the legs.
Mathematical notation looks like this: S = ½ av.
To find out the area of the base in general terms, the following formulas are useful: Heron and the one in which half of the side is taken to the height drawn to it.
The first formula should be written like this: S = √(p (pa) (pc) (ps)). This entry contains a semiperimeter (p), that is, the sum of three sides divided by two. nine0006
Second: S = ½ na*a.
If you want to know the area of the base of a triangular prism, which is regular, then the triangle is equilateral. It has its own formula: S = ¼ a 2 * √3.
Quadrangular prism
Its base is any known quadrilateral. It can be a rectangle or a square, a parallelepiped or a rhombus. In each case, in order to calculate the area of \u200b\u200bthe base of the prism, you will need your own formula. nine0006
If the base is a rectangle, then its area is determined as follows: S = av, where a, b are the sides of the rectangle.
When it comes to a quadrilateral prism, the base area of a regular prism is calculated using the formula for a square. Because it is he who lies at the base. S \u003d a 2.
In the case when the base is a parallelepiped, the following equality will be needed: S = a * na. It happens that a side of a parallelepiped and one of the angles are given. Then, to calculate the height, you will need to use an additional formula: na \u003d b * sin A. Moreover, the angle A is adjacent to the side «b», and the height is na opposite to this angle. nine0006
If a rhombus lies at the base of the prism, then the same formula will be needed to determine its area as for a parallelogram (since it is a special case of it). But you can also use this one: S = ½ d 1 d 2. Here d 1 and d 2 are two diagonals of the rhombus.
Regular pentagonal prism
This case involves splitting the polygon into triangles whose areas are easier to find out. Although it happens that the figures can be with a different number of vertices.
Since the base of the prism is a regular pentagon, it can be divided into five equilateral triangles. Then the area of \u200b\u200bthe base of the prism is equal to the area of one such triangle (the formula can be seen above), multiplied by five.
Regular hexagonal prism
Following the principle described for the pentagonal prism, it is possible to divide the base hexagon into 6 equilateral triangles. The formula for the area of the base of such a prism is similar to the previous one. Only in it should be multiplied by six. nine0006
The formula will look like this: S = 3/2 and 2 * √3.
Problems
№ 1. A regular straight line is given. Its diagonal is 22 cm, the height of the polyhedron is 14 cm. Calculate the area of the base of the prism and the entire surface.
Solution.
The base of a prism is a square, but its side is not known. You can find its value from the diagonal of the square (x), which is related to the diagonal of the prism (d) and its height (h). x 2 \u003d d 2 — n 2. On the other hand, this segment «x» is the hypotenuse in a triangle whose legs are equal to the side of the square. That is, x 2 \u003d a 2 + a 2. Thus, it turns out that a 2 \u003d (d 2 — n 2) / 2. nine0006
Substitute the number 22 instead of d, and replace “n” with its value — 14, it turns out that the side of the square is 12 cm. Now just find out the base area: 12 * 12 \u003d 144 cm 2.
To find the total surface area, add twice the base area and quadruple the lateral area. The latter is easy to find by the formula for a rectangle: multiply the height of the polyhedron and the side of the base. That is, 14 and 12, this number will be equal to 168 cm 2. The total surface area of the prism turns out to be 960 cm2.
Answer.
The base area of the prism is 144 cm2. The entire surface — 960 cm 2 .
No. 2. Dana The base is a triangle with a side of 6 cm. The diagonal of the side face is 10 cm. Calculate the areas: the base and the side surface.
Solution.
Since the prism is regular, its base is an equilateral triangle. So its area is 6 squared times ¼ times the square root of 3. A simple calculation yields: 9√3 cm2. This is the area of one base of the prism.
All side faces are the same and are rectangles with sides of 6 and 10 cm. To calculate their areas, it is enough to multiply these numbers. Then multiply them by three, because the prism has exactly so many side faces. Then the area of the side surface is wound 180 cm 2 .
Answer.
Areas: base — 9√3 cm 2, side surface of the prism — 180 cm 2.
Any polygon can lie at the base of the prism — a triangle, a quadrilateral, etc. Both bases are exactly the same, and accordingly, by which the angles of parallel faces are connected to each other, they are always parallel. At the base of a regular prism lies a regular polygon, that is, one in which all sides are equal. In a straight prism, the edges between the side faces are perpendicular to the base. In this case, a polygon with any number of angles can lie at the base of a straight prism. A prism whose base is a parallelogram is called a parallelepiped. A rectangle is a special case of a parallelogram. If this figure lies at the base, and the side faces are located at right angles to the base, the parallelepiped is called rectangular. The second name of this geometric body is rectangular. nine0006
What it looks like
There are quite a lot of rectangular prisms in the environment of modern man. This, for example, is the usual cardboard from under shoes, computer components, etc. Look around. Even in a room, you will surely see many rectangular prisms. This is a computer case, and a bookcase, and a refrigerator, and a cabinet, and many other items. The form is extremely popular mainly because it allows you to use the space as efficiently as possible, whether you are decorating the interior or packing things in cardboard before moving. nine0006
Properties of a rectangular prism
A rectangular prism has a number of specific properties. Any pair of faces can serve as its, since all adjacent faces are located at the same angle to each other, and this angle is 90 °. The volume and surface area of a rectangular prism is easier to calculate than any other. Take any object that has the shape of a rectangular prism. Measure its length, width and height. To find the volume, it is enough to multiply these measurements. That is, the formula looks like this: V \u003d a * b * h, where V is the volume, a and b are the sides of the base, h is the height that coincides with the side edge of this geometric body.