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Pc= 2ab+2ac+2bc= 2*12*5+ 2*8*5 + 2*12*8= 392 cm2
Pole całkowite: 392 cm2
12*8=96 cm2 *2 = 192 cm2
480/96 = 5
(5*12)*2=120 cm2
8*5*2 = 80 cm2
192+120+80 = 392 cm2