| Name | Name:Icosagon | Name:Octadecagon |
| Sides | Sides:20 | Sides:18 |
| Interior Angle | Interior Angle:162.00 | Interior Angle:160.00 |
| Sum of Interior Angles | Sum of Interior Angles:3240 | Sum of Interior Angles:2880 |
| Description | Description:A polygon with 20 sides is called an icosagon | Description:A polygon with 18 sides is called an octadecagon |
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