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P = πr² = π4,5²=20,25πm²
π=3,14
20,25 * 3,14 = 63,585 m²
P = πr2
p = π 4.5²
P = 20.25πm²
Jeśli z ≈ 20.25 * 3.14 = 63,585m2
daj naj;)