How to use loop function for finding the several angles?

Sorry

Answer 1

[KSSV]

clc; clear all ;
A = [10,10]; B = [5,60]; 
C1=[ 11.1902   78.9215
   43.7123   84.8152
   26.2182   55.0542
   89.4285   18.3821
   41.1215   32.8977
   62.8533  101.3337
   26.5649   25.2378
   70.1982   92.5817
   36.2971   63.8342
   75.4079  109.6135] ;

ABC = zeros(size(C1,1),1) ;
for i = 1:size(C1,1)
    C = C1(i,:) ;
    x = [B(1) A(1) C(1)];
    y = [B(2) A(2) C(2)];
    x1 = x(1); y1 = y(1);
    x2 = x(2); y2 = y(2);
    x3 = x(3); y3 = y(3);
    ang1 = atan2(abs(det([x1,x2,x3;y1,y2,y3;1,1,1])), ...
        (x2-x1)*(x3-x1)+(y2-y1)*(y3-y1));
    ABC(i) =180/pi*(ang1) ;% this is ABC angle
end