Base – Each of the circular ends on which the cylinder rests is called its base. Axis – The line segment joining the centres of two circular bases is called the axis of the cylinder . Radius – The radius of the circular bases is called the radius of the cylinder . Height – The length of the axis of the cylinder is called the height of the cylinder . Lateral Surface – the curved surface joining the two bases of a right circular cylinder is called its lateral surface. Faces – A ... Calculator online for a circular cylinder . Calculate the unknown defining surface areas, height, circumferences, volumes and radii of a capsule with any 2 known variables. Online calculators and formulas for a cylinder and other geometry problems. Learn what a cylinder is in Maths—plus formulas, solved examples, and real-life uses. Easily find volume, surface area, and application tips for exams.