# Curved Surface Area, CSA of cylinder

CSA of cylinder: A cylinder is one of the most basic curved three-dimensional geometric shapes, with the surface formed by the points at a fixed distance from a given line segment, known as the axis of the cylinder.

The Surface Area of the Cylinder:

1. Curved surface area (CSA)
2. Total surface area (TSA)

### Curved Surface Area (CSA) of Cylinder

CSA of cylinder is defined as the area of its curved surface after excluding the area of its two circular bases. It is also called Lateral surface area (LSA).

If a cylinder has base radius ‘r’ and height ‘h’ then,

Curved surface area (CSA) of cylinder = 2πrh sq. units.

### Total Surface Area (TSA) of Cylinder

The total surface area of a cylinder is defined as the sum of areas of its curved surface and two circular bases.

If a cylinder has base radius ‘r’ and height ‘h’ then,

TSA of cylinder = Area of curved surface + Area of its two circular bases

TSA of cylinder = 2πrh + 2πr2 sq. units

TSA of cylinder = 2πr (h + r) sq. units

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