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The right prisms

Source: licencja: CC 0.

Graniastosłupy proste

Learning objectives

  • You will get familiar with the right prisms as well as the relevant terminology in English.

Learning effect

  • You identify and describe the right prisms.

  • You recognise the nets of the right prisms.

  • You indicate the length of the edge of the prism.

  • You identify and describe the right prisms in English.

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nagranie abstraktu

Study the properties of the cuboids, the cubes and other prisms using the materials available online on epodreczniki.pl.

Task 1
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nagranie abstraktu

Open the applet. By changing the slide value observe how the vertices, the edges and the faces of the prism change.

Describe the prisms you will see.

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Geogebra aplet - graniastosłupy o podstawie wielokątów foremnych od 3 do 10 boków. Galeria z opisami alternatywnymi poniżej.
Source: GroMar, licencja: CC BY 3.0.
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nagranie abstraktu

On the basis of your observation answer the following questions:

  • How many vertices does the prism with the pentagonal basebasebase have?

  • How many faces does the prism with the quadrangular base have?

  • What figure is the basebasebase of the prism with six lateral edges?

Task 2
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nagranie abstraktu

Decide if the following sentences are true or false:

a) There are more faces than vertices in the right prismright prismright prism.

b) Circles can be bases of the right prism.

c) There exists a right prism with 9 vertices.

d) There exists a right prismright prismright prism with 48 edges and 18 faces.

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nagranie abstraktu

Notice that:

  • In the right prismright prismright prism the number of the vertices is greater than the number of the faces but smaller than the number of edges.

  • The number of vertices of the prism is always an even number.

  • The number of the edges of the prism is divided by 3.

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nagranie abstraktu

Learn the general rule

The prism with the polygonal basebasebase with n vertices has got:

  • 2n vertices,

  • 3n edges including n lateral edges and 2n basebasebase edges,

  • (n + 2) faces including n lateral faces and 2 bases.

Task 3
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nagranie abstraktu

The sum of the lengths of all edges of the prism is 54 cm:

a) Calculate the length of the altitude of the prism, if the basebasebase is a triangle with the sides of 4 cm, 4 cm, 7 cm.

b) Calculate the length of the base edgeedgeedge of the prism, if the altitude is 6 cm and its basebasebase is a rhombus.

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nagranie abstraktu

Summarise the material you have learned by answering the following questions:

  1. What is the difference between the cubecubecube and the cuboidcuboidcuboid?

  2. What elements is the right prismright prismright prism with the hexagonal basebasebase made of?

  3. What elements does the netnetnet of the triangular right prism consist of?

  4. Is every cubecubecube a cuboid?

  5. What is the difference between the nets of the cuboidcuboidcuboid and the right prismright prismright prism with a parallelogram base?

Task 4
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nagranie abstraktu

An extra task:

Draw the netnetnet of the right prismright prismright prism with the altitude of 5 cm, and the bases of:

a) right triangles with the adjacent sides of 3 cm and 4 cm,

b) a rhombus with the diagonals of 8 cm and 10 cm.

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nagranie abstraktu

Remember

  • The right prismright prismright prism is a spatial figure with two bases of identical polygons and the lateral faces of rectangles.

  • The name of the prism depends on the type of its polygonal base for example the prism with the basebasebase of a pentagon is called a pentagonal prism.

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nagranie abstraktu

The prism with a polygonpolygonpolygon basebasebase with n vertices has got:

  • 2n vertices,

  • 3n edges,

  • (n + 2) faces.

Do the exercises summarizing the class.

Exercises

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Exercise 1
Wersja alternatywna ćwiczenia: The prism with a polygon base with n vertices has got Możliwe odpowiedzi: 1. 2n faces, 2. 3n vertices, 3. (n + 2) faces, 4. 2n vertices, 5. 3n edges, 6. (n + 2) edges
zadanie
Source: GroMar, licencja: CC BY 3.0.
Exercise 2

Two nets of prisms are presented in the following drawings. Write the length of the edges marked with the letters.

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Source: GroMar, licencja: CC BY 3.0.
Exercise 3

Draw:
- the net of the cuboid with the dimensions of 2,5 cm x 5 cm x 10 cm,
- the net of the cube with the edge length of 5 cm.

Use the colours indicated below to mark particular elements:
- blue for one pair of parallel faces,
- red for one pair of the edges which are perpendicular after assembling the model.

Make models of the split nets and check, if you were right.

Describe the properties of the cuboid and the cube in English.

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Exercise 4
Wersja alternatywna ćwiczenia: Indicate which pairs of expressions or words are translated correctly. Możliwe odpowiedzi: 1. pionowy - vertical, 2. podstawa - base, 3. siatka - net, 4. ściana - face, 5. prostopadłościan - cube, 6. sześcian - cuboid
zadanie
Source: GroMar, licencja: CC BY 3.0.
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Interaktywna gra, polegająca na łączeniu wyrazów w pary w ciągu jednej minuty. Czas zaczyna upływać wraz z rozpoczęciem gry. Jeden ruch to odkrywanie najpierw jednej potem drugiej karty z wyrazem. Każdy wyraz jest odczytywany. Kolejny ruch to odkrywanie trzeciej i czwartej karty. W ten sposób odsłuchasz wszystkie wyrazy. Nawigacja z poziomu klawiatury za pomocą strzałek, odsłuchiwanie wyrazów enterem lub spacją. Znajdź wszystkie pary wyrazów.
Source: Zespół autorski Politechniki Łódzkiej, licencja: CC BY 3.0.

Glossary

base
base

podstawa

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wymowa w języku angielskim: base
cube
cube

sześcian – graniastosłup, którego wszystkie ściany są kwadratami

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wymowa w języku angielskim: cube
cuboid
cuboid

prostopadłościan - graniastosłup, którego wszystkie ściany są prostokątami

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wymowa w języku angielskim: cuboid
edge
edge

krawędź

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wymowa w języku angielskim: edge
face
face

ściana

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wymowa w języku angielskim: face
net
net

siatka

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wymowa w języku angielskim: net
polygon
polygon

wielokąt

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wymowa w języku angielskim: polygon
rectangle
rectangle

prostokąt

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wymowa w języku angielskim: rectangle
right prism
right prism

graniastosłup prosty - graniastosłup, którego ściany boczne są prostokątami

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wymowa w języku angielskim: right prism
vertical
vertical

pionowy

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wymowa w języku angielskim: vertical
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Keywords

cubecubecube

cuboidcuboidcuboid

netnetnet

rectanglerectanglerectangle

right prismright prismright prism