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a- średnica walca
r- promień walca
sin60°=√3/2
cos60°=½
z f. trygonometrycznej
sin60°=h/12
√3/2=h/12
2h=12*√3
2h=12√3 /:2
h=6√3
cos60°=a/12
½=a/12
2a=12 /:2
a=6
r=½a
r=½*6
r=3
V=πr²h
V=π*3²*6√3
V=π*9*6√3
V=64√3π [cm³]