Question: Use vectors to decide whether the triangle with vertices P ( 0 , - 4 , - 2 ) , Q ( 1 , -

Use vectors to decide whether the triangle with vertices P(0,-4,-2),Q(1,-1,-4), and R(5,-3,-5) is right-angled.
Yes, it is right-angled.
No, it is not right-angled.
Use vectors to decide whether the triangle with

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