function draw_a_circle(simia,r)
% sinartisi draw_a_circle(simia,r)
% dexete os metablites eisodoy 1) thn digmatolipsia perifereias toy kikloy
% kai tin                      2) akrina toy kikloy
%
%=================== POS KALOYME THN SYNARTISI =========================
%
% draw_a_circle(6,12)  simainei zografise moy kiklo me 6 simia kai r=12
% draw_a_circle(16,12)  simainei zografise moy kiklo me 16 simia kai r=12
% draw_a_circle(100,1)  simainei zografise moy kiklo me 100 simia kai r=1
%
% oso megaliteri einai i proti timi toso megaliteri akribeia exei o kiklos
% os kiklos

simia_kikloy = linspace(0,2*pi,simia); 
kiklos_x = r*cos(simia_kikloy);
kiklos_y = r*sin(simia_kikloy);
plot(kiklos_x,kiklos_y);
end