In Fig., a = 40°. The value of b is (a) 20° (b) 24° (c) 36° (d) 1 – InterviewSolution

1.

In Fig., a = 40°. The value of b is (a) 20° (b) 24° (c) 36° (d) 120°

Answer»

(a) 20^o

Given, a = 40^o

Then, 2a = 2 × 40 = 80^o

From the figure, angel formed on the straight line are equal to 180^o,

Then, 5b + 2a = 180^o

5b + 80^o = 180^o

5b= 180^o – 80^o

5b = 100^o

b = 100/5

b = 20^o

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