Doubt about plotting in Matlab and finding intersect points

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);

#Doubt #2

In the other hand, I would like to find the intersection points between those lines and the circle.

Answer 1

[Stephen23]

"...if I plot the circle with the lines, the circle deforms to an oval"

axis('equal')

https://www.mathworks.com/help/matlab/ref/axis.html#buk989s-1-style

[Ameer Hamza]

For double # 2: https://www.mathworks.com/matlabcentral/fileexchange/22441-curve-intersections

[ErikJon Pérez Mardaras]

I have tried that and doesn't work the "interX" function.

When I execute the example program that appears in that link, Matlab shows me that message:

[Ameer Hamza]

You need to download the files from the posted link and add them to MATLAB's path. https://www.mathworks.com/help/matlab/matlab_env/add-remove-or-reorder-folders-on-the-search-path.html

[ErikJon Pérez Mardaras]

Thanks to both! Cheburashka and Ameer Hamza

[Stephen23]

@Ameer Hamza: thank you!