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If #A = <4 ,2 ,-5 >#, #B = <-8 ,4 ,9 ># and #C=A-B#, what is the angle between A and C?

1 Answer

A. S. Adikesavan

Feb 23, 2016

arc cos (19 / #sqrt#430) = 23.6 deg, nearly.

Explanation:

C = <12, #-#2, #-#14>.
The angle between A and C is
arc cos (A.C/(product of the lengths of A and C))

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