Question 827569
Distance between the points using Distance Formula, and then divided by 2, gives you the size of the radius.  Becomes the variable, r.


Midpoint Formula gives you the point for the center.   Becomes, (h,k).


Standard Form equation for a circle is {{{(x-h)^2+(y-k)^2=r^2}}}.


---At least TRY first, before asking for more help on this.