2. 职称英语
  3. [img]2014m5x/ct_egreqm_egreqjs_0113_20135[/img] In the figure above, what is th

[img]2014m5x/ct_egreqm_egreqjs_0113_20135[/img] In the figure above, what is th

游客2025-02-24  34
问题
In the figure above, what is the value of a?
选项 A、15°
B、25°
C、30°
D、45°
E、115°
答案 A
解析 The correct answer is A. To solve this problem, recall the relationships between opposite angles. You are given the angle measures of two angles in one of the triangles in the figure: 40° and 25°. Therefore, the third angle must measure 180°-40°-25° = 115°. The angle opposite this angle will also measure 115°. You now know two of the angle measures for the triangle containing angle a, and can calculate the value of angle a: 180°-50°-115° = 15°.
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