The centroid of a shape defines a point about which the area of the cross section is evenly distributed. The centroidal distance is the distance from the centroid to the extreme fiber of a cross section.
![](https://www.abbottaerospace.com/wp-content/uploads/2019/05/160.png)
Centroid by Integration:
![](https://www.abbottaerospace.com/wp-content/uploads/2019/05/163.png)
Centroid by Area Moment Summation for a Composite Area:
![](https://www.abbottaerospace.com/wp-content/uploads/2019/05/164.png)