Translate between the geometric description and the equation for a conic section. Derive the equation of a circle of given center and radius using the Pythagorean Theorem; complete the square to find the center and radius of a circle given by an equation.
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Find the center and radius of a circle given the equation in factored form.
Find the center and radius of a circle given the equation in unfactored form.
Learn more: http://www.khanacademy.org/video?v=Dru0RHgfp2g
Let's identify (and graph) a couple of more conics!
A set of 12+ questions created by Khan Academy's Sandy Knight.