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H=?
Pc = 2Pp+Pb
267 =50 +Pb
Pb= 267-50
Pb= 217
Pb = 4*a*H
217 = 4*5*H
217= 20H /:20
H= 10,85
V= Pp*H
V= 25 *10,85 = 271,25
Odp. Objętość graniastosłupa wynosi 217,25cm3.