Gergonne Point, Nagel Point, and Isotomic Conjugates
The Gergonne point and the Nagel point are ISOTOMIC CONJUGATES. Point G is the trace of Ge on side BC. Point N is the trace of Na on side BC. The midpoint of side BC is also the midpoint of G and N.
Thin Slice Pythagorean Discovery
Ellipse inscribed in irregular convex quadrilateral
Proving Angles formed by Parallel Lines
Resultant Force & Moment
Properties of a Square