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Pc=2Pp+Pb
276=2a²+Pb
276=2*5²+Pb
276=2*25+Pb
276=50+Pb
Pb=276-50
Pb=226
Pb=4*a*H
226=4*5*H
226=20H(obustronnie):20
H=11,3
V=Pp*H
V=a²*H
V=5²*11,3
V=25*11,3
V=282,5cm³
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