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Ok so I am currently homeschooled, and Im having some trouble with geometry. Can anyone explain the concept of the equation of a circle for me?

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The equation of a circle is a way to express the definition of acircle on the coordinate plane. If the center of the circle is at the origin of the coordinate plane, the equation is where r is the radius. When the center of the circle is at the point (h,k), the equation becomes .
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