Page 161 - Start Up Mathematics_3

3 Look at the given picture and write the number of:

(a) horizontal lines ________ (b) vertical lines ________

(c) slanting lines ________ (d) curved lines ________

Corners and Sides Side
Corner Corner
A point where two straight lines meet is known A B
as a corner. The lines joining two adjacent corner
points are called sides. Side Side

Look at the given figure. The line joining adjacent
corners A and B is side AB. The line joining Corner D C
adjacent corners B and C is side BC and so on. Side Corner

The line joining the opposite and non-adjacent P Q
corners of a straight-sided shape is called a diagonal. Diagonal Diagonal

In square PQRS, Q and S are opposite and non-
adjacent corners. So, QS is a diagonal. Similarly, PR
is also a diagonal.

S R
EXERCISE 11.1

Complete the following table using the given shapes.

S. Shape Name Number Number Number Example
No. of sides of corners of diagonals

1. square 4 4 2 A chessboard

2.

3.

4.

5.

6.

153