Circles and Conic Sections


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




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Related Pages
Conic Sections: Circles
Conic Sections: Ellipses
Conic Sections: Parabolas
Conic Sections: Hyperbolas

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)

Writing Equations Of Circles

This video covers writing equations of circles given information like the radius, center, or a point the circle goes through and the center.



Try out our new and fun Fraction Concoction Game.

Add and subtract fractions to make exciting fraction concoctions following a recipe. There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics of fraction addition and subtraction or challenge yourself with the insane level.

Fraction Concoction Game



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