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[O,-90°] A(x , y) → A' (y , -x)
K (12 , 15) → K' (15, - 12)
K' (15 , - 12)
ditranlasikan a = 4 b = -6
A (x , y) → A' (x+a , y+b)
K' (15 , -12) → K" (15+4 , -12-6)
K" (19 , -18) (C)