单选题If the measures of the angles of a triangle are in the ratio of 2：3：4, what is the measure of the smallest angle of the triangle?A20B25C30D40E45
单选题
If the measures of the angles of a triangle are in the ratio of 2：3：4, what is the measure of the smallest angle of the triangle?
A
20
B
25
C
30
D
40
E
45
参考解析
解析：
Let 2x, 3x, and 4x represent the measures of the three angles. 2x+3x+4x=180, x=20. Hence 2x=40.
Let 2x, 3x, and 4x represent the measures of the three angles. 2x+3x+4x=180, x=20. Hence 2x=40.
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