#C6----------------------------------------------
plane p 0 0 0 1 0 0 0 1 0
pcone p p 15 17 25 180
profile pf o 15 4 10 p 1 0 0 0 1 0 l 5 t 0 20 \
t -5 0  
revol p2 pf 15 0 0 0 0 1 170
bfuse f p p2
nexplode f f
depouille result f 0 0 1 f_8 -3 5 0 30 0 0 1 \
f_6 -3 5 0 30 0 0 1

set square 3608.6