TRC 10/90, 1 M radius x 90° (3'-3" radius x 90°) arc length 5'-1½"
TRC 15/90, 1.5 M radius x 90° (4'-10½" radius x 90°) arc length 7'-8"
TRC 20/90, 2 M radius x 90° (6'-6" radius x 90°) arc length 10'-2½"
TRC 3-/90, 3 M radius x 90° (9'-10" radius x 90°) arc length 15'- 5½"