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62800 cm = 2.3,14.r. 500
62800 = 3140 r
r = 20 cm
Keliling = 62,800 : 500 = 125,6 cm
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Keliling = πd
125,6 = 3,14 x d
125,6/3,14 = d
40 = d
jika diameter 40 cm, maka jari-jari 40 : 2 = 20 cm