Stores the numerator and the denominator to find angle C :
numerator = c * c + b * b - a * a - d * d ; x = numerator / denominator ; Console . WriteLine ( " C : ▁ " + Math . Round ( ( ( Math . Acos ( x ) * 180 ) / 3.141592 ) * 100.0 ) / 100.0 + " ▁ degrees " ) ;