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Pole 1 sciany bocznej =Pb1=a·h
to Pp=75%·Pb1=0,75ah
pole boczne bryly wynosi zatem Pb=4·a·h
Pc=2Pp+Pb
264=2·0,75ah+4ah
264=1,5ah+4ah
264=5,5ah
ah=264:5,5=48
to Pp=0,75·48=36cm²
czyli a²=36
a=√36=6 cm --->kraw,podstawy
Pb=ah
48=6·h /:6
h=8 cm ---->wysokosc bryły