If vertex P in square PQRS is pinned and square PQRS is rotated about vertex P, what is the number of degrees the square

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C

D

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Source: Economist

If vertex P in square PQRS is pinned and square PQRS is rotated about vertex P, what is the number of degrees the square must be rotated until the first time that vertex Q will be in the position where vertex S is now?

A. 45
B. 90
C. 135
D. 180
E. 270

The OA is B