Bayangan titik A(-1 3) setelah dicerminkan oleh garis y = -2 kemudian dirotasi terhadap titik Pusat O(0,0) sejauh 90° searah putaran jarum jam adalah
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o Pencerminan terhadap y = h => (a, 2h-b)
cermin : y = -2
A(-1,3) => A' = (-1, 2.(-2) - 3)
= (-1, -4-3)
A' = (-1,7)
o Rotasi 90 derajat searah jarum jam = Rotasi -90 derajat =![\left[\begin{array}{ccc}cos90&sin 90\\-sin90&cos90\end{array}\right] \left[\begin{array}{ccc}x\\y\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dcos90%26sin%2090%5C%5C-sin90%26cos90%5Cend%7Barray%7D%5Cright%5D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dx%5C%5Cy%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{ccc}cos90&sin 90\\-sin90&cos90\end{array}\right] \left[\begin{array}{ccc}x\\y\end{array}\right]")
= (y,-x)
A'(1,7) => A'' = (7 , (-1).(-1))
A'' = (7,1)