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  3. In triangle ABC, what is the value of y?

In triangle ABC, what is the value of y?

admin2013-05-19  66
问题 In triangle ABC, what is the value of y?
选项 A、35°
B、50°
C、65°
D、75°
E、70°
答案E
解析 The correct answer is E. To solve this problem, first calculate the value of the third angle in the triangle. Because the angle is adjacent to a 105°, its measure must be 75°. Therefore, y must equal 180-75-35 = 70.
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