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Ob=4a
17dm=4a
a=17/4dm
a=4,25
P=a²
P=4,25²
P=18,0625[dm²]
17 dm : 4 = 4,25
a=4,25 (Bok)
Pole = a2
Pole = (4,25) 2 = 18.0625 dm2 =180,625 cm2
Odp. Bok ma długość 4,25 dm, pole wynosi 18,0625 dm2.