How to modify loop

I'm attempting to modify code to loop

[José-Luis]

How does the code you show help you with your objective? It is not Matlab syntax.

Answer 1

[Roger Stafford]

There is no single matlab function that will calculate it, but you can
make use of the geometrical theorem that the radius of a circumscribing
circle of a triangle is equal to the product of its three sides divided by
four times the triangle's area.

   a = sqrt((x1-x2)^2+(y1-y2)^2); % The three sides
   b = sqrt((x2-x3)^2+(y2-y3)^2);
   c = sqrt((x3-x1)^2+(y3-y1)^2);
   s = (a+b+c)/2;
   A = sqrt(s*(s-a)*(s-b)*(s-c)); % Area of triangle
   R = a*b*c/(4*A); % Radius of circumscribing circle