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h₁=√(5²-3²)
h₁=4
Pp=(3+9)/2*4
Pp=24
h=V/Pp
h=140/24=35/6
V-140cm3 [sześciennych]
Pb=9*(35/6)+3*(35/6)+2*(5*(35/6))
Pb=52,5+17,5+2*(175/6)
Pb=70+350/6=128 ⅓
Pc=24+128 ⅓
Pc=152⅓