In a triangle abc, angle a = angle b = 21 °. Find the corner c.

univerkov | December 7, 2020 | education

Given:
∆ABC
∠A = ∠B = 21 °
Find: ∠С
Decision:
∠А + ∠В + ∠С = 180 °
21 ° + 21 ° + ∠С = 180 °
42 ° + ∠С = 180 °
∠С = 180 ° -42 °
∠С = 138 °
Answer: ∠С = 138 °

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