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Pp = a*h:2 = 5cm *5 cm :2 = 12,5 cm
Pb =15 * 5 = 75 cm
Pc=Pp*2+Pb = 12,5 * 2 + 75 cm =100 cm kwadratowych (:
Wzory są dobre ale mam nadzieje że dobrze podałś wymiary