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1/6 = pnjng busur/ 2. 6,28
1/6 = panjang busur. 3,14
panjang busur = 1/6 dibagi 3,14
panjang bsur = 18.84
1/6 . π . d
1/6 . 3,14.40
1/6 . 125,6
20,933 cm
maaf kalau salah