How to graph circles using the center and radius

Given the equation of a circle, we can put the equation in standard form, find the center and radius of the circle from the standard form, and then use the center and radius to graph the circle. Alternately, given the graph of the circle, we can identify the center and radius from the graph and then plug those values into the standard equation of the circle in order to get its equation.

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Finding the circumference of a circle

The circumference of a circle is the distance around the circle (its perimeter). You can find the circumference if you know either the radius or the diameter.

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How to find the center, radius, and equation of the sphere

To find the radius, it’s important that we take the square root of the right-hand side, and not just the full value from the right

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