To illustrate that the medians of a triangle concur at a point (called the centroid), which always lies inside the triangle.
A centroid of a triangle is the point where the three medians of the triangle meet. A median of a triangle is a line segment from one vertex to the mid-point on the opposite side of the triangle.
The centroid is also called the center of gravity of the triangle. If you have a triangle plate, try to balance the plate on your finger. Once you have found the point where it will balance, that is the centroid of that triangle.
Acute-angled(a) Right-angled(b) Obtuse-angled(c)
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