Question

what is a centroid ?? how we can define ???​

Answer 1

In mathematics and physics, the centroid or geometric center of a plane figure is the arithmetic mean position of all the points in the figure. The definition extends to any object in n-dimensional space: its centroid is the mean position of all the points in all of the coordinate directions.

To Define :

The centroid of a triangle is the point of intersection of its medians (the lines joining each vertex with the midpoint of the opposite side). The centroid divides each of the medians in the ratio 2:1, which is to say it is located ⅓ of the distance from each side to the opposite vertex (see figures at right).

Answer 2

from, in mathematic till figure is the explanation of what is a centroid and from, the definition till coordinate directions is the explanation of the 2nd part of the question