Three, Because it's 3-dimensional (3D)
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That of course will depend on their dimensions of which none have been given
In order to find the volume of the cylinder more information is required as to the actual dimensions of the cylinder. Volume is calculated by knowing the radius and height of the cylinder.
The question cannot be answered. You could have an infinitely long but infinitesimally thin cylinder, or an infiniteimally short but infinitely wide cylinder. In between these two extremes there are an infinite number of possible combinations.
In two dimensions, 12. In 3 dimensions, 24.
one Actually a rectangle has two dimensions, they are height and width :)