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r₂=r₁+40%r₁ 1%=0.01
r₂=r₁+0.4r₁=1.4r₁
Pk₂=πr₂²
Pk₂=π1.4r₁²=1.96πr₁²
Pk₂:Pk₁= 1.96πr₁² :πr₁²=1.96=196%
pole wzrosło o 96%