# Prove that the points (0, 0), (5, 5) and (—5, 5) are the vertices of a right isosceles triangle.

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Prove that the points (0, 0), (5, 5) and (-5, 5) are the vertices of a right isosceles triangle.

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Let A(0, 0), B(5, 5) and C(-5, 5) be the given points

Therefore, ABC is a right isosceles triangle.