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 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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