File:Overhand-folded-ribbon-pentagon.svg
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Overhand-folded-ribbon-pentagon.svg (SVG file, nominally 800 × 495 pixels, file size: 1 KB)
Summary
| Description |
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. |
| Date | |
| Source |
Self-made image, generated from the following PostScript vector source code: %!
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 |
| Author | AnonMoos |
| Permission (Reusing this file) |
 W3C-validity not checked. |
| Other versions |
 |
Licensing
|
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 07:31, 9 December 2012 | | 800 × 495 (1 KB) | wikimediacommons>AnonMoos | eliminate minor annoying kink at top, slight margin readjustment |
File usage
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