...random between « and — a.] 13829. (R- CHAHTREB.) — If from the vertex A of a triangle there he drawn to the base the altitude AD, the bisector of the angle AK, and the median AF, then, if DE = 3EF, the sides of the triangle will be in arithmetical progression....
AE, and the median AF, then, if DE = 3EF, the sides of the triangle will be in arithmetical progression. 