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Equation of a Circle

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More Lessons for Grade 9

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Videos, worksheets, games and activities to help Geometry students learn how to find the equation of a circle given information the radius, center, or a point the circle goes through and the center and how to sketch a circle given its equation.

What is the equation of a circle in standard form?
The equation of a circle is (x - h)2 + (y - k)2 = r2, where (h,k) is the center of the circle and r is the radius.

Covers writing equations of circles given information like the radius, center, or a point the circle goes through and the center.
Graphing a circle given its equation in standard form
Plotting center and radius of a circle; sketch.

Writing the Equation of a Circle in Standard Form
This video shows a specific example of how to find the center and radius when given the equation of a circle.


You can use the Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem. Then click "Answer" to check your answer.

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