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History
Heptagon
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In geometry, a heptagon or septagon is a seven-sided polygon or 7-gon.
Heptagon divided into triangles, clay tablet from Susa, 2nd millennium BCE
Heptagon divided into triangles, clay tablet from Susa, 2nd millennium BCE
Heptagonal dome of the Mausoleum of Prince Ernst
Heptagonal dome of the Mausoleum of Prince Ernst
Polygon
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In geometry, a polygon is a plane figure made up of line segments connected to form a closed polygonal chain.
Historical image of polygons (1699)
Historical image of polygons (1699)
The Giant's Causeway, in Northern Ireland
The Giant's Causeway, in Northern Ireland