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36cm:4=9cm
a=9cm
P=a*a
P=9cm*9cm=81cm2
Odp. Pole tego kwadratu wynosi 81 cm2.
obwód = a + a + a + a = 4a
4a = 36 cm
a = 36/4 = 9 cm
P - pole = a razy a = 9 razy 9 = 81 cm²