Complete the following table. 3 D object Number of vertices Number of edges Number of faces Cube Triangular Prism Cuboid Tetrahedron Rectangular Pyramid Sphere Cylinder Cone Triangular Pyramid

3 D objects have one or more surfaces either plane or curved or both. These surfaces are called faces of the solid. The faces intersect forming a line segment called the edge of the solid. These edges intersect at points called the vertices of the solid. Based on the above information we are required to complete the following table. 3 D object Number of vertices Number of edges Number of faces Cube 8 12 6 Triangular Prism 6 9 5 Cuboid 8 12 6 Tetrahedron 4 6 4 Rectangular Pyramid 5 8 5 Sphere 0 0 1 Cylinder 0 2 3 Cone 1 1 2 Triangular Pyramid 4 6 4

Draw a cube with dimensions 3 × 3 × 3 on a squared and isometric sheets.

We are required to draw a cube with dimensions 3 × 3 × 3 on a squared and isometric sheets. Sketches of solids that give a correct idea of the shape even though the measurements are not same are called oblique sketches. These oblique sketches are drawn on a squared sheet or on the graph paper. A cube of dimension 3 × 3 × 3 is shown on a squared sheet below. Isometric sheet is a paper which is divided into equilateral triangles made up of dots or lines. We can use an isometric sheet to draw sketches with given measurements. The sketch on an isometric sheet has the same measurements as the actual solid and is called the isometric sketch. A cube of dimension 3 × 3 × 3 is drawn on an isometric sheet below.

E M B I B E

I Did It>Chapter 11 - 3D Visualisation>Exercise 11.1>Q 1

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7th CBSE

IMPORTANT

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Write the name of the shape represented by a birthday cap.

Important Questions on 3D Visualisation

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7th CBSE

IMPORTANT

I Did It>Chapter 11 - 3D Visualisation>Exercise 11.1>Q 1

Write the name of the shape represented by a tube light.

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7th CBSE

IMPORTANT

I Did It>Chapter 11 - 3D Visualisation>Exercise 11.1>Q 2

Label the following figure and write the vertices, edges, and faces in terms of the labeled vertices.

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7th CBSE

IMPORTANT

I Did It>Chapter 11 - 3D Visualisation>Exercise 11.1>Q 2

Label the following figure and write the vertices, edges, and faces in terms of the labeled vertices.

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7th CBSE

IMPORTANT

I Did It>Chapter 11 - 3D Visualisation>Exercise 11.1>Q 2

Label the following figure and write the vertices, edges, and faces in terms of the labeled vertices.

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EASY

7th CBSE

IMPORTANT

I Did It>Chapter 11 - 3D Visualisation>Exercise 11.1>Q 2

Label the following figure and write the vertices, edges, and faces in terms of the labeled vertices.

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MEDIUM

7th CBSE

IMPORTANT

I Did It>Chapter 11 - 3D Visualisation>Exercise 11.1>Q 3

Complete the following table.

$3 D$ object	Number of vertices	Number of edges	Number of faces
Cube
Triangular Prism
Cuboid
Tetrahedron
Rectangular Pyramid
Sphere
Cylinder
Cone
Triangular Pyramid