Question

If circle P is tangent to both the x-axis and the y-axis. If the coordinates of the center are (r,r) what are the points of tangency?

Answer 1

(0,r)
(r,0)

Answer 2

(0,r) and (r,0)

Answer 3

tangent line is always perpendicular to line from center
axis is vertical or horizontal so angle is 90 degrees from line from center
thus point on axis corresponds to location of center