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a = 7
b = 9
c = 15

If this is a right triangle c would the hypotenuse
by Pythagorean theorem
where the  hypotenuse or c =  \sqrt{a^2+b^2}

c =  \sqrt{7^2+9^2}

c = \sqrt{130}

since c was \sqrt{130} and not equal to 15 the triangle is not a right triangle.
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