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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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