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kali Diameter
Karena 105 adalah diameter, tinggal 22/7 = Pie kali dengan 105 =330 cm
4. 60 dm = 6 m
Radius = 3 m
Area = 3.14 = Pie kali dengan 3 kali 3 =28.26 m²
5. Luas lingkaran = 268.66625
268.66625 = Pie kali dengan r²
268.66625 dibagi 3.14(Pie) = r²
85.5625 = r²
r = 9.25
Diameter = 9.25+9.25 = 18.5 cm