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r = 18,84 cm / 2 π
Pole koła = π r² = π (18,84 cm / 2 π)² = π (354, 9456 cm²/ 4 π²) =
= 354,9456 cm² / 4 π = 354,9456 cm² / 4 * 3,14 = 354,9456 cm² / 12,56 =
= 28,26 cm²
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