Perimeter of Semicircle Calculator

Perimeter of semicircle calculator calculates the perimeter of a semicircle by knowing its radius or diameter.

Semi Circle Perimeter Formula

The Perimeter of a circle is

2πr

r = radius of a circle.
π ≈ 3.1415926.

Therefore, the semi circle perimeter formula is half of the circle plus the length of diameter(D) or 2 times of radius(r).

πr + 2r or

πr + D

How to Find the Perimeter of a Semicircle

To find the Perimeter of a semi circle, we need to know its radius or diameter,
the radius is half of the diameter.

For example, a semi circle with a diameter of 10,
that is also a radius of 5.

The perimeter calculation is:
3.1415926 x 5 + 10 ≈ 25.71.