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2r = 12 : 2 = 6cm
r = 6: 2 = 3
h = ? = d√3/2 ( d razy pierwiastek z trzech na dwa)
V=? = Pp * h
h = 12√3/2 (12 skruci się z 2)
h = 6√3
Pp=πr²
Pp= 3²π
Pp = 9π
V= 9π * 6√3
V = 54√3 π
V = (nie wiem czy to ci potrzebne) 54√3 * 3,14 (to jest liczba pi)
V = 169,56cm³