Posted by dave on Friday, March 1, 2013 at 6:58pm.
make your sketch using the parallelogram property of vectors.
The resultant of 8 will be the diagonal of the quadrilateral with sides 3 and 8
let the angle opposite the resultant be Ø
by the cosine law:
8^2 = 8^2 + 3^2 - 2(8)(3)cos∏
48cosØ = 9
cosØ = 9/48
Ø = 79.163°
so by the ||gm property, the angle between the two vectors is
180-79.163 = appr 100.8°
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