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1.017,36 cm² = 4×3,14×r²
1.017,36 cm² = 12,56×r²
r² = 1.017,36 cm² / 12,56
r² = 81 cm²
r = √81 cm²
r = 9 cm
1.017,36 = 3.14 × r × r
r×r = 1.017,36 / 3.14
r^2 = 324
r = 18