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5 June, 10:29

Prove that the polygon with coordinates A (1,1) B (4,5) and C (4,1) is a right triangle

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  1. 5 June, 12:33
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    AC = C - A = (3,0)

    BC = C - B = (0,-4)

    AC•BC = 0

    so ∆ABC is a right triangle with m
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