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Khan Academy
Khan Academy: Algebra: Conic Sections: Intro to Circles
A video lesson introducing the standard form for the equation of a circle. Starts out with a circle centered at the origin and then discusses the changes to both the equation and the graph when a circle is centered elsewhere. Illustrates...
Khan Academy
Khan Academy: Algebra: Conic Sections: Algebra Ii: Circles and Logarithms
An instructional video in which six example problems are solved. Topics include: changing a conic equation to standard form in order to identify and describe it; using properties of logarithms to simplify expressions and solve equations;...