Stores the numerator and the denominator to find angle A
double numerator = a * a + d * d - b * b - c * c ; double denominator = 2 * ( a * b + c * d ) ; double x = numerator / denominator ; Console . WriteLine ( " A : ▁ " + Math . Round ( ( ( Math . Acos ( x ) * 180 ) / 3.141592 ) * 100.0 ) / 100.0 + " ▁ degrees " ) ;