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P=πr²
P=π(1,1r)²=1,21πr²
(1,21πr²-πr²)*100%=1,21*100%=121%
121%-100%=21%
pole zwiększy się o 21%
b)
P=πr²
P=π(2r)²=4πr²
(4πr²-πr²)*100%=3*100%=300%
pole zwiększy się o 300%