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V=25 cm sześciennych
H=6 cm
V=1/3 Pp × H
25 cm₃= 1/3 × a² × 6cm /× 3
75cm³= 3a² × 18 cm
75/18= 3a²
a²=12.5
√5×0.25=a
a=0.5√5
wzór na przekątna kwadratu : a√2
0.5√2×5 = 0.5√10