A triangle has vertices A(-1,3,4), B(3,-1,1) and C(5,1,1). Determine if it is a right triangle.

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Q: How be came? W412 431/ 3 1+ w²+2 0.4w 4-w² = 0, (w² + 2) (4 w²) + 0.4w² = 0, - w4 - 2.4w² - 8 = 0.

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