Question

In triangle ABC, angle C = 3 angle B, angle C = 2(angle A+ angle B) then, angle A, angle B, angle C are respectively.
(a) 30°, 60°, 90°
(b) 20°, 40, 120°
(c) 45°, 45°, 90°
(d) 110°, 400, 50°
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Answer 1

Answer:

30,60,90

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Answer 2

Answer:

20,40,120

C=3B ....*

C=2A+2B, 3B=2A+2B, B=2A, A=B/2= 0.5B ....*

A+B+C = 180

0.5B + B + 3B = 180

4.5 B = 180

B = 40

A= B/2 = 20

C= 3B = 120