Select three elements of the given triangle ABC (any combination of sides and angles) by clicking on them.[br]Using these elements try to construct a triangle congruent to the given triangle ABC.[br]The segments can be moved by dragging the solid point; rotated by dragging the empty point; clicking the empty point will construct a circle.[br]The angles can be moved by dragging the thicker side; rotated by dragging the empty point or the vertex; the sides can be extended by dragging the endpoints.[br]If your construction has sides parallel to the corresponding sides of the given triangle, you can check your construction by dragging triangle ABC over the constructed triangle.[br]Will all possible combinations of three elements work?[br]Detailed instructions and videos are available at :[url]http://lima.osu.edu/people/iboyadzhiev/GeoGebra/congruentTrianglesTh.html[/url]