A cylinder is a 3D geometric shape with two parallel circular bases and a curved surface.

To find the volume, use the formula V = πr²h, where 'r' is the radius of the base and 'h' is the height.

Calculate the surface area of a cylinder using A = 2πr² + 2πrh, considering the two circular bases and the curved surface.

For a cylinder with a radius of 3 units and height of 6 units, the volume is V = π(3²)(6) = 54π cubic units.

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Understanding cylinders is crucial for solving problems related to objects like cans, pipes, and containers in fields like engineering and architecture.