prologues:=2;
beginfig(1);
u:=0.025cm;
pickup pencircle scaled 1;
draw (280.0u,1060.0u)--(280.0u,900.0u);
label.lft(btex $y$ etex,(280u,1060u));
draw (280.0u,900.0u)--(480.0u,900.0u);
label.bot(btex $x$ etex,(480u,900u));
draw (280.0u,1020.0u)--(400.0u,900.0u);
label.lft(btex $2\omega $ etex,(280u,1020u));
label.bot(btex $ 2\omega $ etex,(400u,900u));
draw (280.0u,960.0u)--(340.0u,900.0u);
label.lft(btex $\omega $ etex,(280u,960u));
label.bot(btex $\omega $ etex,(340u,900u));
draw (285.0u,980.0u)..(310.0u,930.0u){dir -45}..(350.0u,910.0u);
dotlabel.llft(btex $A$ etex,(310u,930u));
label.top(btex $B$ etex,(340u,930u));
pickup pencircle scaled 2.5;
draw (340u,930u)..(340u,930u);
endfig;
end