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Mathematics, 22.10.2019 05:00 eric8020

After a rotation of 90° about the origin the coordinates of the vertices of the image of a triangle are a’(6,3), b’(-2,1), c’(1,7). what are the coordinates of the vertices of the pre-image

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After a rotation of 90° about the origin the coordinates of the vertices of the image of a triangle...
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