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szerokość - x
2(12,4+x) = 41,8 |:2
12,4+x = 20,9
x = 20,9-12,4
x = 8,5
P = 12,4*8,5
P = 105,4 [cm^]
41,8-24,8=17
17:2=8,5
P=12,4*8,5=105,4