Find a*b. |a|=6

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2 years ago

Find a*b. |a|=6, |b|=5, the angle between a and b is 2pi/3

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chuckwebb9 Staff answered 2 years ago

The dot product can be found using the formula |a|*|b|*cos(0), where 0 is the smallest angle between a and b. 6*5*cos(2pi/3) Multiply. 6*5*(-.5)=-15 Result: -15

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