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Geometry and Trigonometry / Lines, angles, and triangles Difficulty: Hard

Quadrilaterals PQRS and WXYZ are similar, where P , Q , and R correspond to W , X , and Y , respectively. The measure of ∠S is 135 °, P S = 45 , and W Z = 9 . What is the measure of ∠Z?

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Explanation

Choice D is correct. Corresponding angles in similar figures have equal measure. It's given that quadrilaterals PQRS and WXYZ are similar and that P, Q, and R correspond to W, X, and Y. It follows that ∠S corresponds to ∠Z. It's also given that the measure of ∠S is 135°. Therefore, the measure of ∠Z is 135°. 

Choice A is incorrect and may result from conceptual errors.

Choice B is incorrect and may result from conceptual errors.

Choice C is incorrect. This is the supplement of the measure of ∠Z, not the measure of ∠Z.