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Panjang Busur AB = 44
(120/360)K = 44
(1/3).phi.d = 44
(1/3).(22/7).d = 44
(22/21).d=44
d = 44(21/22)
d = 42
r = d/2
r = 42/2
r = 21 cm
Jadipl panjang jari jari OA = 21 cm
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