Steps of Construction:[br]Use polygon tool to make a triangle.[br]Use mid-point tool to get the mid-points of the sides.[br]Draw line segment between each of the three vertices and the mid-points on the opposite sides.[br]Using intersecting tool to get the intersecting point of the line segments.[br]The line segemnts are concurent and their point of intersection is the centroid.

Use other GeoGebra tools to get the centroid. Try out different ways to get the centroid.