Asked by Haizif Khan
Find x so that the triangle with vertices A=(8, 5, −1), B=(16, x, −4), and C=(3, 11, 4) has a right angle at A.
Answers
Answered by
oobleck
You need AB•AC = 0
(16-8)(3-8)+(x-5)(11-5)+(-4+1)(4+1) = 0
(16-8)(3-8)+(x-5)(11-5)+(-4+1)(4+1) = 0
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