DylanM7790 DylanM7790

09-01-2018
Mathematics

contestada

Find a ·
b. |a| = 8, |b| = 7, the angle between a and b is 2π/3

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carlosego carlosego

21-01-2018

By definition we have that the scalar product of two vectors is given by:
a.b = | a |. | b | .cos (angle)
Substituting the values
a.b = (8) * (7) * (cos (2π / 3)) = - 28

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