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Given that X (9,8) was rotated clockwise a number of degree to become X'(8,-9)

User Knetsi
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1 Answer

18 votes
18 votes

Consider that a rotation of 90° consists:

T(x,y) = > T'(y,-x)

you can notice that the rotation X(9,8) => X'(8,-9) is preciselly a rotation of 90°.

90°

User Jooyoung
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