*midsegment*of a triangle is a segment that connects the midpoints of any two sides of the triangle. This applet demonstrates that the three midsegments of any triangle divide the original triangle in four congruent triangles. The demonstration is based on the following properties:

- The midsegment is parallel to the third side of the triangle.
- Any parallelogram has a rotational symmetry with center the intersection point of the diagonals and angle of rotation 180∘

Irina Boyadzhiev, 9 February 2014, Created with GeoGebra

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