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.

3988_Writing_standard_equation_of_a_circle.html

3986_Features_of_a_circle_from_its_standard_equation.html

3987_Graphing_a_circle_from_its_standard_equation.html