Divide the bottom of a 3-meter-high cylinder into many equal sectors, and then cut the cylinder into an approximate cuboid with the same height as its bottom. The surface area of a cuboid is larger than that of a cylinder 12 square meter. What is the volume of the original cylinder?

Solution: According to the meaning of the problem,

The radius of cylindrical ground is r = 12/(2 * 3) = 2m.

So the cylinder volume V=3. 14*2*2*3=37.68 cubic meters.