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P=2ab+2bc+2ac
P=2*3cm*4cm+2*3cm*10cm+2*4cm*10cm
P=24cm+60cm+80cm
P=164cm²
odp.Pole prostopadłościanu wynosi 164cm²
2. 216:12=18
P=6a2 (a do kwadratu)
P = 6 *18cm2 = 6 * 324 cm2 = 1944 cm2