Tetracontagon
![](/Images/godic/202502/15/Regular_polygon_40.svg0031.png")
![The symmetries of a regular tetracontagon. Light blue lines show subgroups of index 2. The left and right subgraphs are positionally related by index 5 subgroups.](/Images/godic/202502/15/Symmetries_of_tetracontagon0031.png")
![](/Images/godic/202502/15/Regular_polygon_truncation_20_2.svg0031.png")
![](/Images/godic/202502/15/Regular_polygon_truncation_20_3.svg0031.png")
In geometry, a tetracontagon or tessaracontagon is a forty-sided polygon or 40-gon. The sum of any tetracontagon's interior angles is 6840 degrees.
Tetracontagon
英语百科
- Reinforced Sheath
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- reinforced slab
- Reinforced soil
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- reinforced union paper
- reinforced weld