Use this pentagon area calculator to calculate pentagon area quickly by entering the side length. The pentagon area formula provides accurate results.
a = side length
Use this formula to calculate the area of a regular pentagon.
| a | Area |
|---|---|
| 2 | 6.88191 |
| 3 | 15.4843 |
| 4 | 27.5276 |
| 5 | 42.0449 |
| 6 | 59.0550 |
1. Take the side length (a).
2. Square the side length.
3. Multiply by √(5(5 + 2√5))/4 to find the area.
This pentagon area calculator automatically computes the area using the pentagon area formula with up to six decimal places.
• Regular pentagons have equal sides and angles.
• Pentagons appear in architecture and tiling patterns.
• The area formula involves the golden ratio via √5.
• Pentagons are part of the structure of many flowers and natural patterns.
• The US Pentagon building has a pentagonal shape.