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kraw,podstawy=a
wysokosc bryly =h
tg60°=h/a
√3=h/a
h=a√3
V=Pp·h=a²·a√3=a³√3
64√3=a³√3 /:√3
a³=64
a=∛64=4
to h=4√3
odp: Kraw,podstawy ma dlugosc 4