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P= 25cm2
P prostokąta= 2*x
P= 2x
Musisz obliczyć długośc drugiego boku prostokąta?
2x + 2 * 2
2 x + 4 = 20
x=3 - drugi bok prostokata
pole prostokąta a * b
2 * 3 = 6
pole kwadratu 5 * 5 = 25
i gotowe
pozdrawiam :**