Length of Cut Pieces on a Curve

Find the angle of a fabricated pipe turn, it is the same no matter what the angle.  
 

Angle of Cut:  \(\; A=\frac{number\ of\ degrees\ of\ the\ turn}{number\ of\ welds\ times\ 2}\)

Angle of Cut:  \(\; A=\frac{90°}{3\ x\ 2}=15°\)

Three welds are required for a 4 piece 90° turn or any other angle.