#I1----------------------------------------------
polyline p 0 0 10  0 0 0  20 0 0  20 0 10  
beziercurve bc 4  20 0 10  15 0 11  5 0 9  0 0 10
mkedge bc bc
wire p p bc
mkplane p p
prism p p 0 20 0
box bx 5 5 2 10 10 20
bfuse f p bx
nexplode f f
depouille result f 0 0 1 f_4 3 5 5 22 0 0 1

set square 2082.25