Discover Napoleon's Theorem by constructing points of concurrency of special lines in triangles. Investigate whether all points of concurrency produce the same result. Construct angle bisectors, altitudes, medians and perpendicular bisectors, and use their points of concurrency in this task. Excellent activity for cooperative groups and differentiation. Students may use Geometer's Sketchpad, Cabri, or compass and protractor to construct the special lines in triangles.