The applet is about the construction of the unique inellipse inscribed in an arbitrary (convex) pentagon.[br]The construction is based on the duality of homogeneous lines, points and curves and on the Marden’s Theorem (rather tough subject).[br]Reference: (Agarwal et al.) [url=http://www-personal.umd.umich.edu/~mkagarwa/AgarwalAMS.pdf]http://www-personal.umd.umich.edu/~mkagarwa/AgarwalAMS.pdf[/url]