A(x,y) becomes A'(y,-x):
So:
x(-5, 8) ------------>x'(8,5)
For a 90 Degree Rotation counter clockwise:
A(x,y) becomes A' (-y,x)
Therefore:
A(1,5)----------->A'(-5,1)
B(3,6)----------->B'(-6,3)
C(5,2)------------>C'(-2,5)
D(3,1)------------->D'(-1,3)
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