How can i identify in the graph of an ellipse where is b, a, c, the vertices, the foci, the latus rectum, the essentricity and the directrix.

Question

Please reply. Needed for my studies tonight :/ midterm exam tom. :/

Answer 1

http://www.youtube.com/watch?v=8A1BsHbXWBE

latus rectum:
http://www.emathzone.com/tutorials/geometry/length-of-latus-rectum-of-ellipse.html