Asked by Topperlearning User | 31st Aug, 2016, 10:29: PM

Expert Answer:

a equals 9 comma space b equals 10 comma space c equals 6
cos left parenthesis A right parenthesis equals fraction numerator b squared plus c squared minus a squared over denominator 2 b c end fraction equals fraction numerator 100 plus 36 minus 81 over denominator 2 x 10 x 6 end fraction equals 11 over 24
cos left parenthesis B right parenthesis equals fraction numerator a squared plus c squared minus b squared over denominator 2 a c end fraction equals fraction numerator 81 plus 36 minus 100 over denominator 2 x 9 x 6 end fraction equals 17 over 108
cos left parenthesis C right parenthesis equals fraction numerator a squared plus b squared minus c squared over denominator 2 a b end fraction equals fraction numerator 81 plus 100 minus 36 over denominator 2 x 9 x 10 end fraction equals 29 over 36

Answered by  | 1st Sep, 2016, 12:29: AM