Asked by Topperlearning User | 31st Aug, 2016, 10:40: PM

Expert Answer:

b squared equals a squared plus c squared minus 2 a c cos B
equals 16 plus 25 minus 40 fraction numerator 1 over denominator square root of 2 end fraction equals 41 minus 28.28 equals 12.71
b equals square root of 12.71 end root equals 3.56

Answered by  | 1st Sep, 2016, 12:40: AM