In the triangle ABC, the angle a-angle B = 60 ° and the angle B-angle C = 15 ° are used to find the degree of ∠ a ∠ B ∠ C

In the triangle ABC, the angle a-angle B = 60 ° and the angle B-angle C = 15 ° are used to find the degree of ∠ a ∠ B ∠ C

∠A=60°+∠B;
∠C=∠B-15°；
∴∠A+∠B+∠C=60°+∠B+∠B-15°+∠B=180°；
∴∠B=45°；
∠A=105°,∠C=30°；
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