单选题In the figure below, what is the value of a?A15°B25°C30°D45°E115°
单选题
In the figure below, what is the value of a?
A
15°
B
25°
C
30°
D
45°
E
115°
参考解析
解析:
已知上部倒三角形的两个内角分别为40°和25°,所以第三个角的度数180°-40°-25°=115°,所以与此角相对的下部三角形的角为115°,因此,a=180°-50°-115°=15°。
已知上部倒三角形的两个内角分别为40°和25°,所以第三个角的度数180°-40°-25°=115°,所以与此角相对的下部三角形的角为115°,因此,a=180°-50°-115°=15°。
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