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P=2*1,5*3+2*3*5+2*1,5*5=9+30+15=54
a-krawedz szescianu
P=6*a kwadrat
54=6*a kwadrat/:6
a kwadrat=9
a=3
Liczę na naj... .Proszę
6a²=9+15+30=54
a²=9
a=3