A cylinder's one of the most basic curvilinear geometric shapes, the surface formed by the points at a fixed distance from a given straight line, the axis of the cylinder. The solid enclosed by this surface and by two planes perpendicular to the axis's also called a cylinder. The surface area and the volume of a cylinder have been known since deep antiquity. In differential geometry, a cylinder's defined more broadly as any ruled surface spanned by a one-parameter family of parallel lines. A cyl… (More on Cylindrical)