Question

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′ ?

Answer 1

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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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