Doubt about plotting in Matlab and finding intersect points

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I have 2 doubts,

Doubt #1

In one hand, I am trying to plot a circle as well as some lines. The problem here is that if I plot the circle alone it draws fine, but if I plot the circle with the lines, the circle deforms to an oval (as I show you in the images attached).

The code I have written for that is that one:

%%% DRAW THE CIRCUNFERENCE
hold on
%x and y are the coordinates of the center of the circle
%r is the radius of the circle
%0.01 is the angle step, bigger values will draw the circle faster but
%you might notice imperfections (not very smooth)
ang=0:0.01:2*pi(); 
xp=5*cos(ang);
yp=5*sin(ang);
plot(0+xp,0+yp);
%DRAW LINES AT DIFFERENT ANGLE
hold on;
x=linspace(0,100)';
line0=[0*x];
line1=[0.1763*x];
line2=[0.3639*x];
line3=[0.5773*x];
line4=[0.8391*x];
line5=[1.1917*x];
line6=[1.7320*x];
line7=[2.7475*x];
line8=[5.6713*x];
plot(line0);
plot(line1);
plot(line2);
plot(line3);
plot(line4);
plot(line5);
plot(line6);
plot(line7);
plot(line8);