已知△ABC的三个内角满足关系∠B+∠C=2∠A,则∠A=（ ）.A.30° B.45° C.60° D.90°

题目

已知△ABC的三个内角满足关系∠B+∠C=2∠A,则∠A=（ ）.A.30° B.45° C.60° D.90°

答案

内角满足关系∠B+∠C=2∠A,则∠A=（ ）.A.30° B.45° C.60° D.90°
满足 ∠A = 180÷3 = 60
选C
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