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Maths maths help not sure how to do?
Given that coordinates in 3D cartesian for A is (2,3,0), B is (-3,5,0), C is (5,8,10).
Find the angle for <ABC.
help me im really bad when it comes to vector.
1 Answer
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- Anonymous9 years agoFavorite Answer
vector BA = vector OA - vector OB = <5,-2,0>
vector BC = <8,3,10>
BA . BC = 40-6 = 34
|BA| = sqrt(29)
|BC| = sqrt(173)
---> cos B = 34/(sqrt(29 * 173) , and need a calculator to find B
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