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P sb y R (O,90⁰)
(x,y) ---------→ (-x,y) ------------→ (-y,-x)
Jadi, bayangannya akan menajdi (-y,-x)
Sehingga, bayangannya masing-masing setelah dicerminkan dan dirotasikan adalah :
A' = (-1,-2)
B' = (-1,-6)
C' = (-3,-5)