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\[\cos \theta=\frac{ x \dot y }{ \left| x \right|\left| y \right|}\]

so then just plug in your info, and solve for x dot y, or a dot b in this case.

How did you get the Cos theta = that stuff?

its just a theorem or an equation which comes from the law of cosines

So is it just 3?

Oh they each have 6 So it would be 18>?

18