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This video starts with an overview of the parts of a circle. It explains the formula for writing an equation of the circle.  You will need both the radius and the center to write an equation for a circle. The video then explains several examples of how to use the formula to write equations when given the radius and center.  There is also an example showing how to find the center and radius of a circle when given the equation.

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STANDARD EQUATION OF A CIRCLE FORMULA EXPLAINED!

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This is a diagram of a circle. The equation of a circle is written in blue below. In order to write the equation for a circle, you need the radius, r, and the center which is labeled (h, k).