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P(x,y) dicerminkn x= a dan y = b --> P' (x' , y')
x' = 2a - x
y' = 3b - y
titk pusat lingkaran P(x,y) = (4,-2) di cerminkan titik (2,3) --> a= 2 dan b = 3
x' = 2(2) - 4 = 0
y' = 2(3) - (-2) = 10
Pusat lngkaran P(0,10) r = 4
(x-0)² +(y-10)² = 4²
x² + y² - 20y + 100 = 16
x² + y² - 20y + 84 = 0