Posted by Mik on Friday, September 30, 2011 at 12:58am.
the larger angle Ø must be across from the larger side, so by the cosine law....
16^2 = 10^2+13^2 - 2(10)(13)cosØ
260cosØ = 13
cosØ = 13/260 = 1/20 = .05
Ø = 87.1°
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