Mathematical Reasoning第 61 / 120 题
If a triangle has angles measuring 40° and 75°, what is the third angle?
a.65°
b.55°
c.75°
d.115°
解析
The angles of a triangle sum to 180°, so 180 − 40 − 75 = 65°. This triangle-angle-sum rule holds for every triangle. The missing angle measures 65 degrees.
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