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2Pp=50cm2
276-50=226cm2
Pb=4×a×H
Pb=4×5××H
226=20×H
H=226 : 20
H= 11,3cm
V=25×11,3=282,5cm3
Pc-276cm² V=?
a-5cm
Musimy wyliczyć h z wzoru na Pc
Pc=2*a²+4ah
276=2*5²+5*h
276=60*h
h=276-60
h=216
V=a²*h
V=5*216
V=1080
Odp: Objętość tego graniastosłupa wynosi 1080 cm³