Prove that the point (0,0) ,(5,5) and (-5,5) are the verticed of a right angled isosceles triangle

Prove that the point (0,0) ,(5,5) and (-5,5) are the verticed of a rig

1.	Prove that the point (0,0) ,(5,5) and (-5,5) are the verticed of a right angled isosceles triangle
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