Page 142 - Math Genius C4

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Now, let us explore the features of some solids.

Cube Cuboid Sphere
Vertex Vertex Curved
face
Edge Edge
Face Face

6 faces, 12 edges, 8 ver ces 6 faces, 12 edges, 8 ver ces 1 face (curved)
All the faces of a cube are All the faces of a cuboid are A sphere has no vertex and
squares of the same size. rectangles. Only opposite no edge.
faces are equal.

Hemisphere Cylinder Cone
Edge
Edge Flat face Flat
face Flat
face
Curved
face Curved
Edge face
Curved face
Vertex
2 faces (1 curved and 1 flat) 3 faces (2 flat and 1 curved) 2 faces (1 curved and 1 flat ),
and 1 circular edge and 2 circular edges 1 circular edge and 1 vertex

nets of soLiD

The flattened shape that can be used to make a solid object by folding along the
marked lines is called the net of a solid shape.

nets of a cube

Let us take a cubical hollow box and
open it by cutting along its edges.

This net of a cube shows the flat surface
or the faces of the cube.

Each face is a square of the same size.

The net of a cube can be drawn in many ways. Each
of the following is the net of a cube.

(a) (b) (c) (d)

Trace these nets on a sheet of paper, cut and fold to make a cube.

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