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Prove that the points (1 , -3 , 1) , (0 ...

Prove that the points (1 , -3 , 1) , (0 , 1 , 2) and ( 2 , -1 , 3) are the vertices of a right angled isosceles triangle.

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The correct Answer is:
`AB^(2) = 18 = 9 + 9 = BC^(2) + CA^(2) `
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