Volume of a cylinder = πr²h. Substitute r=13 and h=61: volume = 3.14 × 13 × 13 × 61 = 32370.26 cubic mm. Think of a cylinder as many equal circular layers stacked up. So we find the circular base area πr² and multiply by the height. The answer is in cubic units, so the correct choice is 32370.26 mm³.