vertex v1 -1 0 0
vertex v2 9 0 0
vertex v3 1 1 0
polyvertex w v2 v3 v1 v2
mkplane s w
fixshape  r  s  -maxtaila 10  -maxtailw 0.7

checknbshapes  r  -vertex 3  -edge 3  -wire 1  -face 1  -shell 0  -solid 0  -compsolid 0  -compound 0
checkprops r -l 9.054743851305652