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Find the center-radius form of the equation of the circle with center (4,9) and tangent to the x-a ...
Find the center-radius form of the equation of the circle with center (4,9) and tangent to the x-axis. (Hint: A line tangent to a circle touches it at exactly one point.) Type the center-radius form of the equation of the circle. (Type an equation. Simplify your answer.)