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8-42.

A circle with its center on the line in the st quadrant is tangent to the -axis. .

  1. If the radius is , what is the equation of the circle?

    What point on the line is units from the -axis?

    Use the coordinates of the center and the radius to write an equation in general form.

  2. If the radius is , what is the equation of the circle?

    See part (a).

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