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P₂ = π(r + 20%r)² = πr²*(1,2)² = πr²*1,44
x - πr²*1,44 - πr²
100% - πr²
x = (πr²*1,44 - πr²)*100%/πr² = πr²*0,44*100%/πr² = 44%
jak masz pytania to pisz na pw