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Pp = πr² = π12² = 144π
H = 7
V = 144π*7 = 1008π [j²]
Pp=3,14* (12)2
Pp=3,14 * 144
Pp=452,16
V=Pp*h
V=452,16 * 7
V=3165,12
V=π*12²*7
V=1008π :)