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OpenStudy (anonymous):
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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OpenStudy (luffingsails):
So, for each point you would need to apply the rotation transformation matrix [cos(theta) -sin(theta)] [sin(theta) cos(theta)]
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