#### Answer

To locate the centroid of a triangle, it is not necessary to construct all three medians of a triangle.
To find the centroid of a triangle, it is sufficient to construct two medians. The point where any two medians of a triangle intersect is the centroid of the triangle.

#### Work Step by Step

To locate the centroid of a triangle, it is not necessary to construct all three medians of a triangle.
A median is a line from a vertex of a triangle to the midpoint of the opposite side.
The centroid of a triangle is the point where the three medians of the triangle intersect.
To find the centroid of a triangle, it is sufficient to construct two medians. The point where any two medians of a triangle intersect is the centroid of the triangle.