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

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hope this is clear and that you can understand it 
A triangle ABC with vertices A (1, 5), B (5, 2), and C (-1, 2) is rotated 90º . What-example-1
User Lefteris
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