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b=3a - bok 2. kwadratu
a^2 - pole 1. kwadratu
(3a)^2 - pole 2. kwadratu
a^2 + (3a)^2 = 250
a^2 + 9a^2 = 250
10a^2 = 250
a^2=25
a = 5
bok wiekszego kwadratu to b=3a=3*5=15cm