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A triangle has vertices at A (3,4), B (−3, 2), C (−1, −4). Is the triangle a right triangle? Explain

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draw it
ab = sqrt (36 + 9) = sqrt(45)
bc = sqrt (4 + 25) = sqqrt(29)
ca = sqrt ( 16 + 64) = sqrt(80)
ab^2 + bc^2 = 74
ca^2 = 80 so ca is not the hypotenuse

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