# calculus

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Do the three points (1,2,0), (−2,1,1), and (0,3,−1) form a right triangle?
I think they do by using dot product.
Do the three points (1,1,1)(1,1,1), (2,3,2)(2,3,2), and (5,0,−1)(5,0,−1) form a right triangle?
I think they don't.

• calculus -

you are correct.

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