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Verified answer
P(2, -6) R[(2, 1), π/2] P' (x', y')Φ = π/2 = 90°
x' - p = (x - p) cos 90°- (y - q) sin 90°
x' - 2 = (2 - 2) (0) - (-6 - 1) (1)
x' - 2 = 6 + 1
x' = 7 + 2
x' = 9
y' - q = (x - p) sin 90 + (y - q) cos 90°
y' - 1 = (2 - 2) (1) + (-6 - 1) (0)
y' - 1 = 0
y' = 1
y' = 1
maka bayangan titik P adalah P' (9 , 1)