Are You a Math Genius?
The puzzle, archived on the Season 5 page, involved determining whether three lines would converge in a triangle. In all four triangles, the lines converge. Specifically, the medians converge at the centroid, the angle bisectors converge at the incenter, the perpendicular bisectors converge at the circumcenter, and the altitudes converge at the orthocenter.
Wolfram SpikeyPuzzles provided by Wolfram Research, Makers of Mathematica