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40:16= 2.5
4*2.5= 10 <= a
5*2.5= 12.5 <= b
7*2.5= 17.5 <= c
boki trojkata o obwodzie 40 cm to a, b i c
40:16= 2.5
4*2.5= 10 <= a
5*2.5= 12.5 <= b
7*2.5= 17.5 <= c.