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V=1/3a²h
V=100cm³
a=10cm
h=?
100=1/3 (10)² h
100=1/3 *100*h / :100
1=1/3h /*3
3=h
h=3cm
*oznacza razy
a = 10 cm
Pp * h
V = ----------
3
a * a * h
100 = ----------
3
100 = 10*10 * h : 3
100 = 100h : 3 /: 100
h = 3 cm