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Mathematics 22 Online
OpenStudy (anonymous):

Can someone please help me? Given 4 coordinate points A(2, 0), B(4, 0), C(5, -2), D(1, -2), type the answer for the image that is rotated by 90° about the origin O.

OpenStudy (cornzyblack):

looking like a trapezium

OpenStudy (anonymous):

The rotation matrix for 90 degrees is [(0,-1),(1,0)] so multiply each (x,y) by this matrix to get the image.

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