What is the angle between #<9,-8,1 > # and #< 4,-7,1 >#?

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What is the angle between #<9,-8,1 > # and #< 4,-7,1 >#?

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Answer 1 · 2018-04-18T17:48:11

#<9,-8,1>*<4,-7,1>=|<9,-8,1>||<4,-7,1>cos theta#
#(36+56+1)=(sqrt(9^2+8^2+1^2))(sqrt(4^2+7^2+1^2))cos theta#
#93=98.1631costheta#
#cos theta=0.9474#
#theta=cos^-1 0.9474#
#theta=0.325784303 rad#

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What is the angle between #<9,-8,1 > # and #< 4,-7,1 >#?

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