input geom; l:=7*u; h:=4*u; beginfig(1) draw o--(l,0)--(l,h)--(0,h)--cycle; draw o--(l,h/2)--(l/2,h)--cycle; dotlabel.llft(btex $A$ etex,o); dotlabel.rt(btex $B$ etex,(l,h/2)); dotlabel.top(btex $C$ etex,(l/2,h)); draw geomtick shifted (l/4,h); draw geomtick shifted (3*l/4,h); draw doubletick rotated 90 shifted (l,h/4); draw doubletick rotated 90 shifted (l,3*h/4); endfig; beginfig(2) draw o--(l,0)--(l,h)--(0,h)--cycle; draw o--(l/2,h)--(l/2,0)--(l,h); endfig; end