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330=3,14r2
330/3.14=r2
105,09=r2
akar 105,09=r
10,25=r
330 = 3,14 r²
r² = 330/3,14
= 105,09 atau dibulatkan mnjadi 105
r = √105
d = 2 r = 2 √105 cm²
semoga dapat di pahami