| No.of Sides | Kind of Polygon | No. of Sides | Kind of Polygon |
|---|---|---|---|
| 3 | Triangle | 7 | Heptagon |
| 4 | Quadrilateral | 8 | Octagon |
| 5 | Pentagon | 9 | Nonagon |
| 6 | Hexagonl | 10 | Decagon |
| Pentagon | Hexagon | Octagon | |
|---|---|---|---|
| Perimeter | |||
| P=5R sqrt(10-2 sprt[5])/2 | P=6R | P = 8R sqrt(2-sqrt[2]) | |
| Area | |||
| K=5a sqrt(4R2 -a2)2)/4 | K=3a sqrt(4R2-a2)/2 | K=2a sqrt(4R2-a2) | |
where: