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Pp = 100cm²
krawędź podstawy = √100cm = 10cm
h = 400cm² / 10cm = 40cm
V = Pp x h
V = 100cm² x 40cm = 4000cm³
4000cm³ = 4dm³
Odp. Objętość wynosi 4dm³.
II
Pp = 400cm²
krawędź podstawy = √400cm = 20cm
h = 100cm² / 20cm = 5cm
V = Pp x h
V = 400cm² x 5cm = 2000cm³
2000cm³ = 2dm³
Odp. Objętość wynosi 2dm³.