4. Rotations - 90 degrees counter clockwise, Math, geometry

4. Rotations - 90 degrees counter clockwise by B Maier - May 14, 2013

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A triangle with vertices A (–2, –1), B (–1, 4), and C (5, 0) is rotated 90 degrees counter-clockwise about vertex B. What are the coordinates of the image of vertex A? - Quora

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