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Handheld Brise fan from 1800. A handheld fan, or simply hand fan, is a broad, flat surface that is waved back-and-forth to create an airflow. Generally, purpose-made handheld fans are folding fans, which are shaped like a sector of a circle and made of a thin material (such as paper or feathers) mounted on slats which revolve around a pivot so that it can be closed when not in use.
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Geometric Origami is a book on the mathematics of paper folding, focusing on the ability to simulate and extend classical straightedge and compass constructions using origami. It was written by Austrian mathematician Robert Geretschläger [ de ] and published by Arbelos Publishing (Shipley, UK) in 2008.
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: png -> svg. The original can be viewed here: Parts of a simple polygon.png: . Modifications made by A2569875.
One can use the polygon/star tool (make sure that it's set to "polygon", checkbox at top, and that it's set to 6 corners). Hold down "ctrl" while drawing the first hexagon to get the angles straight. If you only want the hexagon for aliphatic backbones, you can now convert the hexagon to a path (Path -> Object to path) so that you can ...
In geometry, flexagons are flat models, usually constructed by folding strips of paper, that can be flexed or folded in certain ways to reveal faces besides the two that were originally on the back and front. Flexagons are usually square or rectangular (tetraflexagons) or hexagonal (hexaflexagons). A prefix can be added to the name to indicate ...
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A Simple polygon: Date: 16 June 2007, 04:08 (UTC) Source: Own work (Original text: self-made. I just vectorized the image at File:Simple polygon.png, with Inkscape) Author: Oleg Alexandrov: Other versions: Derivative works of this file: Decoupage polygone triangles.svg: SVG development