How to rotate a triangle 90 degrees counter clockwise about the origin

How to rotate a shape 90 degrees clockwise about the origin?

Plot the point M (-2, 3) on the graph paper and rotate it through 90° in a clockwise direction, about the origin. Find the new position of M. Solution: When the point is rotated through 90° clockwise about the origin, the point M (h, k) takes the image M' (k, -h).
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