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单选题
The three interior angles of a triangle have measures of a°, a°, and b°. If b = 80, what is the value of a?
A
30
B
40
C
50
D
60
E
100
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参考解析
解析：
因为三角形内角之和为180度，因此可得出a + a + b = 180，已知b=80，那么2a+80=180，a=50。
因为三角形内角之和为180度，因此可得出a + a + b = 180，已知b=80，那么2a+80=180，a=50。
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