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Heptagon
01
a seven-sided plane shape consisting of seven line segments or edges that meet at seven interior angles
Example
One version of the game featured a board laid out in a grid of non-uniform heptagons instead of the usual squares.
X-ray crystallography revealed the molecular framework contained multiple rings incorporating pentagons and intersecting heptagons.
My young daughter proudly showed me the colorful heptagon she had cut out for her geometry homework assignment.
