Co-Verticies of an Ellipse

Grand13

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May 31, 2013
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I need to know how to find them. I know h,k are how far left right/up down but what are co-verticies and how do I FIND THEM?
 
I need to know how to find them. I know h,k are how far left right/up down but what are co-verticies and how do I FIND THEM?

Covertices are the points a distance "b" from the center of the ellipse. The vertices are a distance "a" from the center.
 
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