Osgood, William F. (William Fogg), 1864-1943, Graustein, William C. (William Caspar), 1888-1941, joint author · New York : The Macmillan Company · leaf 121
or ofFF, the conjugate axis. Thepoint 0 is called the center ofthe ellipse; the points A, A,its vertices. The line-segments AA andBB, which measure the length and breadth of the ellipse,are known respectively as the major axis and the minoraxis of the ellipse. The word axes refers sometimes tothe… … Hence AA = 2a and OA = a. Thus it appears that the length of the semi-axis major, OA,is a. Let the length of the minor axis be denoted by 2b, andthe distance between the foci by 2 c. Then, from the triangleFOB, we have: (2) a*^ = 6^ + c\ Note that, of the three quantities a, h, and c, the quantity…
