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A plane figure with eleven straight sides and angles.
- ‘The regular hendecagon cannot be constructed using the classical Greek rules of geometric construction.’
- ‘Though hendecagons are the most flexible polygons we have examined, there is a downside.’
- ‘The hendecagons in the model are not quite regular.’
- ‘The loonie is a seven-gram, 11-sided disk - technically a hendecagon - 26.5 millimetres in diameter and 1.75 millimetres thick.’
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