The volume for any cylinder, right or oblique, would be base x height. Even though an oblique cylinder looks quite different from a right cylinder, their volumes would be equal (given that their radius and height are equal). Think about it, the area of a parallelogram would equal the area of the rectangle if their heights and bases were the same, so that would apply for this also.
V= Bh The base would stand for that top and bottom of the cylinder, or the circles. The volume for circle is pi x radius squared. V = h V = 256 x 16 V = 4096