Page 186 - Revised Maths Wisdom Class - 3

15 Shapes Formation

Warm Up

● We know that 2-D shapes are called the fl at shapes.We know that 2-D shapes are called the fl at shapes.

● We know that 3-D shapes are called solid shapes.
● Each surface of a solid is known as face.
● Two faces meet at an edge.
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● Three edges meet at a point called corner or vertex.

● Triangle rectangle, square, circle are the examples of fl at shapes.

3-D Shapes

Look around you. Do you see things which are not fl at like paper? They are shaped
diff erently. Some are round like balls and some are long like a pencil.

The shapes, we learned in the previous class that if you draw a shape that looks fl at, like
a circle, square, or triangle, those are 2-D (two-dimensional) shapes. Let us learn about
3-D (three-dimensional) Shapes: cube, cuboid, cylinder, cone, and sphere. They have

three dimensions: length, width, and height. You can hold them, stack them, and even
fi ll them up with things like toys because they have space inside. Each shape is unique
and special in its own way.

The descriptions of 3-D shapes are as follows.
Vertex
(i) Cube

A cube is like a box. It has six faces that are all
square. Each face of a cube is the same size, and Edge
all edges are of the same length. It has 8 vertices
and 12 edges. Face

(ii) Cuboid

Face Cuboids are also like boxes, but they can be
Vertex longer or shorter. They have six faces, just
like cubes, but their faces are not all squares.
Edge They look like as rectangle. It has 12 edges and

8 vertices.