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r=6
r=2/3h=2/3·a√3/2=a√3/3
6=a√3/3
18=a√3
a=18/√3=18√3/3=6√3 cm--->kraw,podstawy
to 1/3h=1/3·a√3/2=a√3/6=[6√3·√3]/6=√9=3
z pitagorasa
3²+H²=hs²
9+8²=hs²
9+64=hs²
hs=√73 cm ---.wysokosc sciany boczn ej ostrosłupa