How to plot a quarter of a circle

This question is most likely too vague to answer, but I am trying to plot the geometry of a quarter circle and am not too sure where to start. To plot the quarter circle, the radius is 5 and there is a text file that has an angle range between 90 to 0 degrees where each value is decreased by 1 degree, i.e. 90, 89, 88 ... 2, 1, 0. If anyone is able to help me figure out how I should approach this problem it would be greatly appreciated.

Answer 1

[KSSV]

% Radius of circle 
R = 1. ; 
% center of cricle 
C = [0. 0.] ; 
% angle 
th = 90:-1:0 ; 
% points of cricle 
xc = C(1)+R*cosd(th) ; 
yc = C(2)+R*sind(th) ; 
plot(xc,yc)

[Griffin Polglaze]

Thanks, but I need to read the text file and use the values from that to generate the plot

[KSSV]

Simple....load the data from test file using load / importdata. Use that data instead of th.