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Question

Find the co-ordinate of the points obtained on rotating (-5.-7) through 90 anticlockwise direction about the origin.

A
(7,-5)
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B
(7,5)
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C
(-7,5)
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D
(-5,7)
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Solution

The correct option is A (7,-5)
Rotation of point P(x,y) through 90 (anticlockwise) about origin = P'(-y,x).
So, the rotation of point P (-5,-7) through 90 (anticlockwise) about origin = P'(7,-5).

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