Polygons in Geometry
Classifications | Formulas
Polygon Classifications
Polygons are classified according to their sides
| 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 | Hexagon | 10 | Decagon |
Regular Polygon Formulas
Pentagon |
Hexagon |
Octagon |
Perimeter |
||
| P=5R sqrt(10-2 sqrt[5])/2 | P=6R | P=8R sqrt(2-sqrt[2]) |
Area |
||
| K=5a sqrt(4R2-a2)/4 | K=3a sqrt(4R2-a2)/2 | K=2a sqrt(4R2-a2) |
Where:
