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Mathematics, 30.10.2021 05:20 dina18

If quadrilateral ABCD rotates 90° counterclockwise about the origin, what are the coordinates of A′ in quadrilateral A′B′C′D′ ? Hint you should use the map (x, y)→(-y, x) A
(2,1)
B
(-2,-1)
C
(-2,-2)
D
(-2,0)

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