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?A30B40C50D60E100
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
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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