1.

Find the value of 'a' in each of the following:​

Answer»

SOLUTION :-

(i) The ANGLE is right angle, i.e, 90°

Value of a = 90° - 60°

= 30°

(ii) The angle is straight angle, i.e, 180°

Value of a = 180° - 63°

= 117°

(III) The angle is straight angle, i.e, 180°

So, 180° = 90° + (a + a)

Or, 180° = 90° + 2a

Or, 180° - 90° = 2a

Or, 90° = 2a

Thus, a = 90/2

a = 45°

(IV) The angle is straight angle, i.e, 180°

So, 3A + 2a + 3a = 180°

Or, 8a = 180°

Or, a = 180/8

Thus, a = 10°


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