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If the measures of the angles of a triangle are in the ratio of 3: 4: 5, what is the measure of the smallest angle of the triangle?

单选题
2022-09-21 20:22
A、25
B、30
C、45
D、60
E、75
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正确答案
C
试题解析

If the angles of a triangle are in the ratio of 3: 4: 5, let 3x, 4x, and 5x represent the measures of the three angles. Since the sum of the measures of the angles of a triangle is 180, 3x+4x+5x = 180, 12x = 180, x=180/12 = 15. Hence, the measure of the smallest angle of the triangle is 3x =45.
标签： 国外英语考试 美国学术能力评估考试（SAT）
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