Law of cosines =
94.09 = 638.65 -289.68 cos θ
(94.09-638)/ (-289.68) =cos θ
1.877 =cos θ
θ = cos^-1( 1.877) =
values of cos θ should be between 0 to 1
but here coming more than 1 so plz check the dimension once ie check once the values of a , b ,c
any doubt plz let me know
I will be happy to help you
Sry I did the wrong calculation
I am giving the correct solution within 5 mints
9.7^2 = 21.3^2+13.6^2- 2 *21.3 *13.6*cos θ
94.09 = 638.65 -579.36 cos θ
Cos θ = (638.65-94.09)/ 579.36 = 0.9399
θ = Cos^-1(0.9399) = 19.65
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