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Circle Equation: Center (h,k)

Author:
Emily Reed, Tim Brzezinski
Topic:
Circle
Explore the interactive activity and answer the questions that appear below the applet.
Suppose P(x,y) = any point that lies on a circle with center (h,k) and radius r, where r > 0. Use what you've observed to write an equation that expresses the relationship among x, y, and r. (No need to square any binomial expressions!)

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