Khan Academy: Features of a Circle From Its Graph

Given the graph of a circle, find its center and radius.

Find the center and radius of a circle given the equation in standard form. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Sal finds the center and the radius of the circle.

Find the center and radius of a circle given the equation in expanded form. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Find the center and radius of a circle given the equation in expanded form.

Find the center and radius of a circle given the equation in standard form.

A detailed explanation of how to find a quadratic equation from its graph using different methods, including using software.

Fit an algebraic two-variable inequality to its appropriate graph. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.

Fit an algebraic two-variable inequality to its appropriate graph.

Video about translating between the graph and equation of trigonometric functions. Examples consist of writing the equation a sine function from its graph and graphing a cosine function from its equation. [5:13]