Silindri

Silindri is the Estonian term for the geometric cylinder, a three-dimensional solid with two parallel circular bases connected by a curved surface.

In a right circular cylinder, the bases are circles of radius r and the distance between them is the height h. The axis of the cylinder is perpendicular to the bases, and all cross-sections parallel to the bases are circles.

The volume of a right circular cylinder is V = π r^2 h. The total surface area is A = 2π r^2 + 2π r h, where 2π r^2 accounts for the two bases and 2π r h accounts for the curved surface.

Cylinders appear in many practical and theoretical contexts. In engineering and everyday objects, they appear as pipes, cans, pistons, and hydraulic cylinders. In architecture and design, cylindrical forms are used for columns and decorative elements. In mathematics, a cylinder can be described as the Cartesian product of a circle and a line segment, and cross-sections perpendicular to the axis are circles.

Notes on usage: in Estonian, silindri is used to refer to the cylinder in various grammatical contexts, including when describing properties such as silindri pindala (cylinder area) or silindri maht (cylinder volume).