#B5----------------------------------------------
plane p 0 0 0 1 0 0 0 0 -1
pcylinder p p 25 35
profile pf o 12 -10 20 l 10 c 5 90 l 10 c 5 90 l 10 \
c 5 90 l 10 c 5 90
polyline pl 0 0 20 0 0 40
pipe p2 pl pf
bfuse f p p2
nexplode f f
depouille result f 0 0 1 f_11 2 0 0 40 0 0 1

set square 10572.7