Half circle is known as semi-circle. Centroid of semi-circle is at a distance of 4R/3π

from the base of semi-circle. As shown in the figure below:

## Centroid of Semi-circle Formula:

\(\bar{Y}= \frac{4R}{3π }\)

## Example

Find the centroid of semi-circle whose radius is 10cm and of 20cm diameter.

### Solution

By using formula for semi-circle

Centroid of semi-circle **= 4R/3π** = (4*10)/3π =** 4.24cm = Answer **

This distance is from the base line of semi circle.