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• 02:06, 15 April 2007 ThePlaz (Talk | contribs) uploaded "File:Polyethylene-repeat-2D-flat.png" (A simpler way of representing the repeating unit. Note, however, that the C−H bond angles are not 90° as this diagram would indicate, but are approximately 110°, since each carbon atom is tetrahedral (sp3). from the [http://commons.wikimedia.org/wiki)