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hitunglah keliling lingkaran dengan jari² 20 cm
K = 2πR
= 2(3,14(20)
= 2(62,8)
= 125,6 CM
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R = 20 cm
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K = 2 × π × r
K = 2 × 3,14 × 20 cm
K = 6,28 × 20 cm
K = 125,6 cm
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