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Pierwszy bok = x
Drugi bok = x + 3,5cm
Równanie = x + x + x + 3.5 + x + 3.5 = 15cm
4x + 7 = 15cm
4x = 8cm
x = 2cm
Pierwszy bok = 2cm
Drugi bok = 2cm + 3.5cm = 5.5cm
Pole = 2*5.5 = 11cm kwadratowych
4a = 8
a = 2 <- jeden bok
a + 3,5 = 5,5 <- drugi bok
P = a · b
P = 2 · 5,5 = 11