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LingkaranPusat P (x,y)= (4,-2)
A dan B titik keliling dan AB diameter
P = 1/2 (A+B)
A+ B = 2P
B = 2P - A
Bx = 2Px - Ax = 2(4) - (-5)= 8+5 = 13
By = 2Py- Ay = 2(-2) - (7) = -4 - 7 = - 11
B(x,y) = (13, -11)