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f=6dm
Pp=e*f/2 (ułamek
Pp=6*4/2
Pp=12dm²
V=Pp*H
120=12*H
H=10dm
0,4m=4dm
129l=120dm³
obliczam pole podsawy graniastosłupa
Pp=½×d₁×d₂
PP=½×4×6
pP=12dm²
V=Pp×h
120=12×h
h=120÷12
h=10dm
wysokość wynosi 10dm