(13.1^2-b^2 15.2^2 30^2)/(2*13.1*15.2)=1.461
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calculate b value
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  Shota Kato
      
 2019-12-3
        syms b 
fun = (13.1^2 - b^2 * 15.2^2 * 30^2 ) / (2*13.1*15.2)==1.461;
ans = solve(fun)
ans =
 -(25638665^(1/2)*1i)/114000
  (25638665^(1/2)*1i)/114000
25638665^(1/2) / 114000
ans =
    0.0444
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