#F2---------------------------------------------- polyline p 2 0 0 10 0 0 10 0 20 2 0 20 2 0 0 mkplane p p revol p p 0 0 0 0 0 1 180 nexplode p e blend p p 2 p_12 1 p_4 nexplode p f depouille result p 0 0 1 p_8 2 0 0 0 0 0 1 \ p_1 1 0 0 10 0 0 1 set square 1273.54