function PlotCircle(x,h,k,r);

%x = -1:.01:1;
%h = 0;
%k = 0;
%r = 1;

y1 = sqrt(r^2 - (x-h).^2) + k;
y2 = -sqrt(r^2 - (x-h).^2) + k;

hold on;
plot(x,y1,'-b');
plot(x,y2,'-b');
