What is the measure of the angle between $v = < - 2, 7 >$ $v = <-2, 7>$ and $w = < 1, - 3 >$ $w = <1, -3>$ ?

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Answer 1 · 2016-04-06T21:31:22

${136.45}^{\circ}$ $136.45^@$

$cos θ = \frac{v ∙ w}{| | v | | | | w | |}$ $costheta=(v•w)/(||v||||w||)$

$thereforetheta=cos^(-1)((-2-21)/(sqrt53sqrt19))$

$=136.45^@$

What is the measure of the angle between v = <-2, 7>v=<−2,7>v = <-2, 7> and w = <1, -3>w=<1,−3>w = <1, -3>?