That is True.
If I am not trippin.Sorry if I am wrong.
The equation of a circle with center
and radius
is

In your case,

Plug these values into the generic formula and you'll get your equation.
D because the two sides have to be larger than the hypotenuse when added
Find the slope between the 2 points and plug inotllto point slope form
=1.3+0.1sqrt29, 1.3-0.1sqrt29