The centroid of a triangle is found by constructing the

Medians

Step-by-step explanation:

The point where the intersection of the medians that are part of a triangle occurs is called the centroid or barycenter. A median is a line that is drawn from one vertex of the figure to the point that is in the middle of the opposite side. It should be note that the distance between the centroid and its corresponding vertex is twice the distance between the centroid and the opposite side. That is, the distance from the centroid to each vertex is 2/3 the length of each median.

I leave you an image where you can see what is the centroid of a triangle.

entering that problem on the tube might get you an answer