Page 144 - Math Genius C4

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For example:

(a) A triangular pyramid has a triangle base and three triangle faces (which
makes four faces in total).

(b) A square pyramid has a square base and four triangle faces.

Triangular Square Rectangular Pengatonal Hexagonal
Pyramid Pyramid Pyramid Pyramid Pyramid

4 Faces 5 Faces 5 Faces 6 Faces 7 Faces
4 Vertices 5 Vertices 5 Vertices 6 Vertices 7 Vertices
6 Edges 8 Edges 8 Edges 10 Edges 12 Edges

BuiLD witH cuBes

Archana and Arav have some cubical blocks. Both make some models using the blocks

as given below.
A. B. C. D.

Can you count the number of cubical blocks used in each model?

In model A, number of blocks used = 14; In model B, number of blocks used = 9

In model C, number of blocks used = 22; In model D, number of blocks used = 30

Practice time 7e

1. Complete the following table.

Name of shape Number of Number Number Number of Number of
face(s) of plane of curved edge(s) vertices
face(s) face(s)
(a) Cube

(b) Cuboid
(c) Cylinder

(d) Cone
(e) Triangular Prism

(f) Square Pyramid

142 Mathematics-4