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OpenStudy (anonymous):
A triangle has vertices A (-1, 3, 4) B (3, -1, 1) and C (5, 1, 1). The area of ABC is a) 30.1 b) 82.1 c) 9.1 d) 52.1
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OpenStudy (anonymous):
It's in 3-space so vectors are best choice Area = | AB X AC |/2
OpenStudy (anonymous):
thanks!
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