Mathematics, 23.10.2019 01:00, sar70

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)
and 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...