Dodecagon
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In geometry, a dodecagon, or 12-gon, is any twelve-sided polygon.
The Vera Cruz church in Segovia
A 1942 British threepence, reverse
Image: Wooden pattern blocks dodecagon
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)
The Giant's Causeway, in Northern Ireland