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=154
154÷22
=7
7×7
=49
jadi, jari jarinya =49
308cm = 22/7 × d
d = 308 ÷ 22/7
d = (308 ÷ 22) × 7
d = 18 × 7
d = 126
r = d ÷ 2
r = 126 ÷ 2
r = 63