What is the sum of focal radii of a vertical ellipse? In my textbook it says 2a but online it says it's 2b. I think it's 2b but I don't get why it's different in my textbook. Also, what is the equation of a vertical hyperbola? It's different from in my textbook and in the UCLA textbook for conic sections; in UCLA it says y^2/b^2 - x^2/a^2, but in my textbook it says y^2/a^2 - x^2/b^2. I asked someone and they said there's no difference but I'm pretty sure they're wrong because I tested it out in desmos and they were completely different. And, what is the difference of focal radii of a vertical hyperbola? Is it 2a or 2b? It says 2b online. Please help!!
2026-04-03 01:34:52.1775180092
Questions on equations for ellipse and hyperbola
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