Show that the equation of a circle with center at the origin and radius r is x2 + y2 = r2 and determine the equation for the graph of a circle with radius r and center (h, k), (x - h)2 + (y - k)2 =r2

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  What is a Circle?

  What exactly is a circle? Learn the answer in this tutorial. You can also see the equation for a circle that's on the coordinate plane!