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2) diameter= 14 cm, luas = 153,86 cm
3) diameter = 28 cm, luas = 615,44cm
4) jari2 = 15 dm, luas = 706,5 dm
5 diameter = 40 cm, luas = 1256cm
2.Diameter=14cm. Luas=22/7×14=44cm². 3.Diameter=28cm. Luas=22/7×28=88cm². 4.Jari-Jari=15dm. 5.Jari-Jari=10