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Slope of each side:

a: (-9,0) and (-7,4)=(4-0)/(-7-(-9))=4/2=2;

b: (-9,0) and (-5,3)=(3-0)/(-5-(-9))=3/4;

c: (-7,4) and (-5,3)=(3-4)/(-5-(-7))=-1/2.

ac=-1, which means the sides are perpendicular so we have a right triangle.

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