Question 1171761
We need to know the distance from the point to the line, which is not described further here.
Suppose it is 7 units.
then the equation of the circle is (x-12)^2+(y-10)^2=49, the radius squared.
Where it touches the line, the equation of the circle equals the equation of the line. Setting each equal to 0 then setting them equal to each other might help.