heptagon

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Related to Septagon: polygon

heptagon

a polygon having seven sides
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Heptagon

A seven-sided regular polygon; the angle included between the seven sides is 128.6 degrees.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

heptagon

[′hep·tə‚gän]
(mathematics)
A seven-sided polygon.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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But septagons cause the sheet to curl in along one axis and outward along the perpendicular axis, so parts of these sheets resemble saddles.
Working with Michael Teter at Corning Inc., in Corning, N.Y., Elser and his group decided to add extra hexagons as well as replace the pentagons with septagons, thereby making it easier for repeating molecules to link up with less strain.
Theorists design new-look fullerenes

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