These lessons are part of a series of lessons for the quantitative reasoning section of the GRE revised General Test. In these lessons, we will learn how to graph and write the equations of circle.

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Equation Of Circle Tutorial

The graph of an equation of the form (*x* − *a*)^{2} + (*y* − *b*)^{2} = *r*^{2} is a circle with its center at the point (*a*, *b*) and with radius *r*.

This video looks at using equations of circles to find the center and the radius of a circle to graph it, as well as, writing an equation for a circle, given the center and radius, or a point on the circle. It includes four examples.

This video shows how to graph and write equations of circles.

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