%
%
%

beginfig(1);

a=2cm;
b=1.8cm;
c=0.9cm;

z0=(0,0); z1=(a,0); z2=(0,a); z3=(-b,-c);

drawarrow z0..z1;
drawarrow z0..z2;
drawarrow z0..z3;

label.top(btex $X$ etex, 0.9[z0,z1]);
label.rt(btex $Z$ etex, 0.9[z0,z2]);
label.top(btex $Y$ etex, 0.85[z0,z3]);

endfig;
end;