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Pb=72cm²
V=Pp·H
Pb=3aH
72=3aH /:3
24=aH
H=24/a
V=a²√3/4 ·H
24√3=a²√3/4 ·24/a
24√3=24a√3/4
24√3=6a√3 /:6√3
a=4 cm--->kraw,podstawy
72=3aH
72=3·4·H
72=12H /:12
H=6cm --->dlugosc krawedzi bocznej graniestoslupa