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12cm = 2 × r
r = 12cm/2
r = 6cm
Keliling lingkaran
= π × d
= 3,14 × 12 cm
= 37,68 cm
atau
= 2 × π × r
= 2 × 3,14 × 6
= 37,68 cm
Keterangan:
π ⇒ phi (3,14 atau 22/7)
d ⇒ diameter
r ⇒ jari-jari
keliling 3,14 ×12 =37,68 pilihannya ad gk kak??? itu hasilnya kakk