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Circles and Conic Sections 2

A series of free, online video lessons with examples and solutions to help Algebra students learn about circles conic sections.

What is the standard form of the equation of a circle?
A circle is a set of points (x, y) which are a fixed distance r, the radius, away from a fixed point (h, k), the center.
The equation of the circle in standard form is
(x - h)2 + (y - k)2 = r2

If a circle is given in general form then we must complete the square on the x and y parts of the equation to rewrite it in standard form.

Conic Sections: The Circle
In this video, you will learn how to identify the equation of a circle, how to write the standard form of a circle from the general form and how to graph a circle.
Conic Sections - Circle Part 1 of 2
Intuitive Math Help Circles

Conic Sections - Circle Part 2 of 2
Circles Intuitive Math Help
This video covers writing equations of circles given information like the radius, center, or a point the circle goes through and the center.

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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