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Question

How to rotate a figure 90° clockwise about a point?


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Solution

Rotate a figure 90° clockwise about a point :

When a point say P(h,k) is rotated about origin O through 90° clockwise direction, the new position will be P(k,-h)

Since to rotate 90° clockwise about a point, every point x,y will rotate to y,-x

Hence, with change of coordinate from P(h,k) to P(k,-h) we can rotation a figure 90° clockwise about a point.


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