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3 years ago

(1 point) Find a⋅b if |a| = 2, |b| = 4, and the angle between a and b is −π7 radians.

Mathematics

1 answer:

AVprozaik [17]3 years ago

3 0

Answer:

a·b = 7.2

Step-by-step explanation:

Given :

IaI = 2; IbI = 4 , $\theta = -\pi/7$

Using Dot product formula:

a·b = IaI IbI cos $(\theta)$

a·b = (2) (4) (cos(-\pi/7[/tex])

a·b = 7.2

Hence Dot product of vector a and b i s:

a·b = 7.2

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