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x' = 2m - x
y' = y
2 = 2m - 4
3 = 3
2m - 4 = 2
2m = 2 + 4
2m = 6
m = 6 / 2
m = 3
Jadi koordinat dicerminkan terhadap garis x = 3
x' = 2(3) - x = 6 - x
y' = y
titik pertama :
x ' = 6 - 3 = 3
y' = 2
= (3, 2)
titik kedua :
x' = 6 - 4 = 2
y' = 3
= (2, 3)
titik ketiga :
x' = 6 - 5 = 1
y' = 6
= (1, 6)
titik keempat :
x' = 6 - 5 = 1
y' = 4
= (1,4)
titik-titiknya :
A' = (3,2) B' = (2,3) C' = (1,6) D' = (1,4)