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17 October, 05:27

A triangle ABC with vertices A (1, 5), B (5, 2), and C (-1, 2) is rotated 90º. What are the coordinates of C'?

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  1. 17 October, 05:55
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    The answer is (-2,-1), by the formula:

    R90 (x, y) = (-y, x)
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