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< MON kecil = 80'
panjang busur pendek MN = 37,68cm
Dit: Panjang busur MN besar....?
< MON besar = 360' - 80' = 280'
,
MN besar/MN kecil = <MONbesar/<MONkecil
MN besar/37,68 = 280/80
MN besar = (37,68 x 280)/80
MN besar = 131,88 cm