Final Cover - For Printing

angle. Enable the child to affix the four pieces together, so that no space is left in

between them. Also teach the child that when the four right angles are put together,

with no space left in between then the angle so formed will naturally be equal to 360^0

which is the angle at a point. The child may also be made aware that two straight

angles will also constitute an angle at a point.

10. Complementary angles
    Two angles are said to be complementary to each other if their sum is equal to a right
    angle and one angle is said to be the complement of the other.

Eg. : 40 o + 50o = 90o

In the above example, the sum of 40o and 50o is equal to 90o and hence, 50o is the

complement of 40o and vice-versa.

A sheet of paper which form an angle of 90o at its vertices be torn into two, at one of
the vertices, each measuring some unknown angle. The two angles thus formed can be
measured and the child be explained that the two angles are complement to each
other, since their sum is equal to a right angle.

11. Supplementary angles
    If the sum of any two angles is equal to a straight angle or 180o then the two angles
    are said to be supplement to each other.

A sheet of paper, neatly cut, which makes an angle of 180o at its sides is torn at one

of its sides, so that one straight angle is divided into two. Now, on measuring the two

(^50400)
0
A
C
B
A^1200600 B
C
O