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P = 25²π = 625π m²
r = 24m
P₁ = 24²π = 576π m²
P-P₁ = 625π - 576π = 49π <---------- to jest pole powierzchni, na której posadzono kwiatki
49π ≈ 49 * 3,14 ≈ 153,86 m²
153,86 * 20 = 3077,2
Odp: Posadzono 3077 sadzonek