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3080 = 3,14 x r^2 x 5
3080 = 15,7 x r^2
r^2 = 196
r = 14
semogamembantu
3080 = 22/7 × r² × 5
3080 = 110/7 r²
r² = 3080/110 ×7
r² =196
r =√196
r = 14