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| View Original: | Overhand-folded-ribbon-pentagon.svg (800x495) | |||
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| Keywords: Overhand-folded-ribbon-pentagon.svg If a flat ribbon or strip is tightly folded into a simple overhand knot of practical knot-tying it assumes a regular pentagonal shape Here a ribbon which is green on one side and blue on the other is shown folded in this way Non-overlapped hidden edges are shown by dotted lines of the appropriate color except that the middle of one line has been removed where it would confusingly intersect the other hidden-edge lines if shown If the two loose ends are joined this becomes a trefoil knot of mathematical knot theory Self-made image generated from the following PostScript vector source code <pre> 300 396 translate 1 3172 dup scale /X 72 mul 90 add def/I X cos 100 mul def /J X sin 100 mul def 4 I 4 J moveto 0 I 0 J lineto 1 I 1 J lineto 1 75 X cos 111 8 mul 1 75 X sin 111 8 mul rlineto 3 X cos 111 8 mul 3 X sin 111 8 mul rlineto 2 I 2 J lineto closepath gsave 87 97 87 setrgbcolor fill grestore 2 65 3 setrgbcolor 2 setlinewidth stroke 3 I 3 J moveto 1 I 1 J lineto 0 I 0 J lineto 4 I 4 J lineto 3 25 X cos 111 8 mul 3 25 X sin 111 8 mul rlineto 2 X cos 111 8 mul 2 X sin 111 8 mul rlineto closepath gsave 92 96 1 setrgbcolor fill grestore 2 3 55 setrgbcolor stroke 4 I 4 J moveto 0 I 0 J lineto 2 I 2 J lineto 3 I 3 J lineto closepath gsave 92 96 1 setrgbcolor fill grestore stroke 5 2 5 2 setdash 3 I 3 J moveto 1 I 1 J lineto stroke 2 65 3 setrgbcolor 5 14 5 14 setdash 2 I 2 J moveto 1 I 1 J lineto stroke 3 I 3 J moveto 0 I 0 J lineto stroke 2 I 2 J moveto 4 25 X cos 45 mul 4 25 X sin 45 mul rlineto stroke 4 I 4 J moveto 1 75 X cos 45 mul 1 75 X sin 45 mul rlineto stroke showpage EOF</pre> 2010 AnonMoos ValidSVG ss 1 thumb center Overhand knots Regular pentagons Images with PostScript source code Pentagrams Strip folding | ||||
