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diketahui :
diameter = 7 cm
jari-jari = 7/2 = 3,5 cm
phi = 22/7
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keliling = 2 × phi × jari-jari
keliling = 2 × 22/7 × 3,5
keliling = 2 × 22 × 0,5
keliling = 2 × 11
keliling = 22 cm
jadi, keliling lingkaran tersebut adalah 22 cm
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