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Lj = 25/360 • πr²
31,4 = 5/72 • 3,14 • r²
31,4 • 72 = 5 • 3,14 • r²
2.260,8 = 15,7r²
r² = 2.260,8 / 15,7
r² = 144
r = √144
r = 12 cm