2. 外语
  3. In the figure below, line t is parallel to line u, and line v is perpendicular to line u. What is the measure of angle a?

In the figure below, line t is parallel to line u, and line v is perpendicular to line u. What is the measure of angle a?

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问题 In the figure below, line t is parallel to line u, and line v is perpendicular to line u. What is the measure of angle a?
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答案90°
解析 The answer is 55°. Since line v is perpendicular to line t, it forms four right angles. Another line, which is unnamed in the diagram, dissects one of the right angles. Angle a is one side and 35° is the given measurement for the other side. These two angles are complementary because they must add up to 90°: 35° + 55° = 90°.
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