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If $A = <4 ,3 ,-7 >$ , $B = <5 ,8 ,-4 >$ and $C=A-B$ , what is the angle between A and C?

1 Answer

A. S. Adikesavan

Mar 13, 2016

87.75 deg, nearly.

Explanation:

A = $< 4, 3, -7 > and C = <-1, -5, -3 >$

The $angle$ between A and C[s
arc cos ( (A.C)/ (product of lengths A and C))

= $arccos (2/(sqrt74sqrt35))= arccos (0.03930)$

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