### Home > CCA2 > Chapter 8 > Lesson 8.1.2 > Problem 8-42

8-42.

A circle with its center on the line in the

^{st}quadrant is tangent to the

*-axis.*

*8-42 HW eTool*(Desmos).

If the radius is

, what is the equation of the circle? What point on the line

isunits from the -axis?Use the coordinates of the center and the radius to write an equation in general form.

If the radius is

, what is the equation of the circle? See part (a).

Use the eTool below for help with this problem.

Click on the link at right for the full eTool version: *CCA2 8-42 HW eTool*