- Take the piece of paper in your hands and fold it along an imaginary line.(Any line is OK).
- Cross the previous line by folding the paper following another imaginary line.
- Fold the paper along a third line, to make a triangle.
- Unfold the paper and try to make the lines very clear and sharp.
- Tear the paper carefully, along the lines you have made.
- Now we have a triangle!
- Hold the triangle in your hands and try to find the middle point of one side by joining the vertices of that side.
- Fold the paper along the line that joins the middle point to the opposite vertex. That is the median of one side.
- Repeat the last two steps to make the other two medians of the triangle.
- The point where the lines cross is called the centroid or barycenter.
