A.L=π(D+h) B.L=π(D-h) C.L=π/D×h D.L=π×D×h
A.L=π(D+h) B.L=π/(D-h) C.L=π×D×h D.L=π/(D+h)
A.L=A+B-2*(R1+d)+π/2*(R1+d)/2 B.L=A+B-2*(R1+d)-π/2*(R1+d)/2 C.L=A+B+2*(R1+d)+π/2*(R1+d)/2 D.L=A-B-2*(R1+d)+π/2*(R1+d)/2