Polygon ABCD is defined by the points A(-5, 1), B(-4, 3), C(-2, 7) and D(-1, 2). If the polygon rotates 90° counterclockwise to create polygon A′B′C′D′, what are the coordinates of C′ ?

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compassionate · Answer

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The expression for rotating counterclockwise is (-y, x). 

Take the coordinates of C(-2, 7) --> (-y, x)

Which becomes (-7, -2) 

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