Question 971535
Length of three sides (edited)

1+2+pi-3 radians =2 pi radians. 

1 radian is arc length = to a radius.

The arcs are 2 radians, 4 radians and  2(pi-3) radians (inches are unit), the last of which equals 0.29318 inches

The angles are 57.29578, 114.59156, and 8.11261 degrees.

Total is 18.29318 inches or 6*pi