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Pp=3cm* 3cm= 9 cm2
Pc= 12cm2+ 9cm2= 21 cm2
P=3*3 * to znaczy razy
P=9 cm
P= 1/2 a * h
P= 1*3
P=3 cm (razy 4 ściany) *4=12 cm
Pc= 12+9=21cm kwadratowych