Sow that the points (-2,5) \'(3,-4) and (7,10) are the vertices of a right triangle

Sow that the points (-2,5) \'(3,-4) and (7,10) are the vertices of a r

1.	Sow that the points (-2,5) \'(3,-4) and (7,10) are the vertices of a right triangle
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