triunghiuri

t = [0 1 1 0;0 1 -1 0];
plot(t(1,:),t(2,:),"r");
axis([-5 5 -5 5],"square");
text(0,0,'A');
text(1,1,'B');
text(1,-1,'C');
grid();
hold on;
t1 = [-1 0 0 -1; -2 -1 -3 -2];
plot(t1(1,:),t1(2,:),"b");
alfa = 2*pi/3;
T = [cos(alfa) -sin(alfa); sin(alfa) cos(alfa)];
R = T*t;
plot(R(1,:),R(2,:),'g');
t2 = (R+[-2;-3])*2;
plot(t2(1,:),t2(2,:),"k");
ogl = t2;
ogl(2,:) = -ogl(2,:);
plot(ogl(1,:),ogl(2,:),"m");
hold off;