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Dengan π = 3,14
Maka,
πr² = 1256
3,14 r² = 1256
r² = 1256 : 3,14
r² = 400
r = √400
r = 20 satuan
1256 = 22/7 x r2
r2 = 1256 : 22/7
r2 = 1256 x 7/22
r2 = 400
r = 20