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Pp-pole podstawy
H-wysokość
a-krawędź podstawy
V=240cm[sześcienne]
H=20cm
V=1/3*Pp*H
obliczam pole podstawy:
240=1/3*Pp*20
240=1/3*20*Pp
720=20*Pp
Pp=36cm^
Pp=a^
36=a^
a=6cm