Extract Geometry

 From:  karter
1614.1 
Hi,

Im tying to recreate a sweep or tapered extrusion from the planar surface shown. I have a line drawn at 45 deg from the topedge. Being there is no extrude tapered I wanted to sweep the line around the edge but seemingly sweep wants a closed curve or the line orientating correctly ?. Question is how would one extract the curves from that planar surface to join together ?

Thanks!
--Paul
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