To rotate the figure 90 degrees clockwise about a point, every point(x,y) will rotate to (y, -x).
geometry - Coordinates of Point after 90 Degree Rotation about
90 Degree Clockwise Rotation (Definition, Examples) Byjus
90 Degree Clockwise Rotation (Definition, Examples) Byjus
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90 Degree Clockwise Rotation Rotation of Point through 90° about
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Rotation of rectangle ABCD, 90 degrees, clockwise.