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h=30 cm=3dm
Pp=x
Pp*h=V
Pp*3dm=27dm3
Pp=27dm/3dm=9dm
x*x=9dm (kwadrat)
x=3dm
27l=27dm³
V=Pp*H
27=a²*3 /:3
a²=9
a=√9=3dm=30cm