Khan Academy Static

Learn about the standard form to represent a circle with an equation. For example, the equation (x-1)^2+(y+2)^2=9 is a circle whose center is (1,-2) and radius is 3.

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4802_Features_of_a_circle_from_its_standard_equation.html

4803_Graphing_a_circle_from_its_standard_equation.html