Question

∠A and ∠B are two supplementary angles such that ∠A= x° and ∠B= (2x+30)°. Find the measure of ∠B.

Answer 1

Answer: 130°

Explanation:

supplementary angle: ∠A+∠B=180°

x+(2x+30)=180

x+2x+30=180

3x+30=180

3x=150

x=50

2(50)+30=100+30=130°

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