Transformation through -90 about the origin

Transformation through -90 about the origin Draw a triangle joining the points (-5, 3), (-7, 1) and (-8, 4) on the graph paper. Find the new position when the triangle is rotated through 90° anticlockwise about the origin. Transformation through +90 about the origin: https://youtu.be/p_4fIxSFul8

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