Page 124 - Fun with Mathematics 2

There are some objects that have either a plane surface or a curved surface or

both. Let us understand by some examples.

Objects with Straight Edges have Plane Surfaces

CHALK BOX BLACKBOARD CUPBOARD

Objects with Curved Edges have Curved Surfaces

BALL ORANGE GLOBE

Objects having Plane and Curved Surfaces

MUSIC DRUM LOG OF WOOD LAWN ROLLER

Let us study about the plane surfaces in detail.

Square

The plane surface of a cube is called a square. D C
Properties of a square:

4
A square has sides. Square Side
l
4
All sides of a square are of equal lengths.
l
4
A square has vertices. Vertex
l A B
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