historyism2 historyism2

16-10-2018
Mathematics

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Point A is located at (3,4) and is rotated 90 degrees counterclockwise about the origin. What is the new point of A?

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jimrgrant1 jimrgrant1

16-10-2018

A'(- 4, 3 )

Under a counterclockwise rotation about the origin of 90°

a point (x, y ) → (- y, x )

A(3, 4 ) → A'(- 4, 3 )

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