o ile procent zwienkszy się obwud trujkąta jeżeli jego bok zwienkszymy o 40%
bok = 140%a = 1,4a obw1 = 3a obw2= 1,4a * 3 = 4,2a 4,2a : 1,4a *100%=300%
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bok = 140%a = 1,4a obw1 = 3a obw2= 1,4a * 3 = 4,2a 4,2a : 1,4a *100%=300%