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40cm³=V
h=5x
40= x² *5x
40=5x³/:5
8=x³
x= 2[cm]
5a - krawedz boczna
V=Pp*H=a*a*5a=5a³
40=5a³
8=a³
a=2
5x - krawędź boczna
V=40cm³
v=Pp*H
x*x*5x=V
5x³=40 /:5
x³=8
x=2
Odp: Krawędź podstawy wynosi 2cm a krawędź boczna 10cm.