The perimeter of a semicircle is the total length of the boundary of the semicircle. It consists of a straight line segment (the diameter of the circle) and half of the circumference of the circle.

Semicircles are commonly used in architecture, such as in the design of arches and domes. The perimeter of a semicircle can be used to calculate the amount of material needed to construct a semicircular structure, such as the perimeter of a dome or the edge of a circular stage. Additionally, the perimeter of a semicircle can be used in mathematical applications, such as in the calculation of the arc length of a curve or in optimization problems.

The formula for determining the perimeter of a semicircle is defined as:

\(P\) \(=\) \(\pi\) \(\cdot\) \(r\) \(+\) \(2\) \(\cdot\) \(r\) \(=\) \(\pi\) \(\cdot\) \(r\) \(+\) \(d\)

\(P\): the perimeter of the semicircle

\(r\): the radius of the circle

\(\pi\): A mathematical constant with an infinite decimal tail

The SI unit of perimeter is: \(meter\text{ }(m)\)

## Find \(P\)

Use this calculator to determine the perimeter of a semicircle when the length of its radius is given.

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the radius of the circle

\(r\)

\(meter\)

\(\pi\) : A mathematical constant with an infinite decimal tail

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