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Decagon
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In geometry, a decagon is a ten-sided polygon or 10-gon. The total sum of the interior angles of a simple decagon is 1440°.
Image: Timurid Qur'an decagon
Image: Timurid Qur'an decagon
Image: Ioanniskepplerih 00kepl 0078
Image: Ioanniskepplerih 00kepl 0078
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