Equation of a Circle (Modeling Geometry)

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A circle has the equation x2 + y2=16.  What is the radius of the circle?

4

A circle has the equation (x+5)2 + (y-2)2 = 9.  What is the center of the circle?

(-5, 2)

A circle has the equation (x-3)2  + (y + 5)2 = 36.  Which of the following statements is false?

The y-coordinate of the center is 5.

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