1888. J. J. Milne, Companion to Weekly Problem Papers, 147. Triangles ABC, A′B′C′ so related, and having the same symmedian lines AKA′, BKB′, CKC′, are called Cosymmedian triangles. Ibid., 150. If two triangles are cosymmedian, the sides of one are proportional to the medians of the other.
