The step "draw the double rays from L" is the previous worksheet (Double Rays from a Point). [i]Steiner's Double Element construction[/i] 1) Double Points on a Circle : [url]http://www.geogebratube.org/material/show/id/35593[/url] 2) Double Rays from a Point: [url]http://www.geogebratube.org/material/show/id/35600[/url] [b]→3) Double Points on a Line[/b] All three constructions use Pappus' Theorem: [url]http://www.geogebratube.org/material/show/id/35140[/url]