Question: Let A = (1, 1,1), B = (3, 2,2), and C = (2, 2,4). Prove that ABC is a right-angled triangle. Let u = AB

LetA= (1, 1,1),B= (3, 2,2), andC= (2, 2,4).

Prove thatABC is a right-angled triangle.

Letu=AB, v=BC, andw=AC.

We must show thatuv, uw, orvw

is zero in order to show that one of these pairs is orthogonal.

uv=uw=vw=

Since _______,ABC is a right-angled triangle.

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