Answer:
1. 90 degrees
2. A(7, 9) A'(-9, 7)
B(7, 1) B'(-1, 7)
C(4, 7) C'(-7, 4)
D(2, 7) D'(-7, 2)
P(x, y) P'(-y, x)
Step-by-step explanation:
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