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If ( 16 · d ) > 160
L = 2 A + 2 B + 16 d

If ( 16 · d ) ≤ 160
L = 2 A + 2 B + 160

Where:

L = Center line length (mm)
A = Leg length mm)
B = Leg length (mm)
C = Leg length (mm)
D = Leg length (mm)
d = Rebar Diameter (mm)
r = Rebar radius (mm)

Note: Keep all units consistant, typical units shown.