r = 2 × luas juring/panjang busur
r = 2 × 12/3
r = 24/3
r = 8
jadi, panjang jari-jari lingkaran tersebut adalah 8 cm.
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r = 2 × luas juring/panjang busur
r = 2 × 12/3
r = 24/3
r = 8
jadi, panjang jari-jari lingkaran tersebut adalah 8 cm.