Stores the numerator and the denominator to find angle D :
numerator = d * d + c * c - a * a - b * b ; x = numerator / denominator ; System . out . println ( " D : ▁ " + Math . round ( ( ( Math . acos ( x ) * 180 ) / 3.141592 ) * 100.0 ) / 100.0 + " ▁ degrees " ) ; }