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_____________ =
Luas Lingkaran (LO)
211,95 cm/LO = sudut DOE/360
LO × 108 = 211,95 × 360
108 × 3,14 × r^2 = 76. 302
339,12r^2 = 76. 302
r^2 = 76. 302 ÷ 339, 12
r^2 = 225
r = 15
Panjang jari-jari OD adalah 15 cm