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Regular Pentagon formulas
3 formulas for Regular Pentagon, from the Mensuration (2D & 3D) section of the Quantix formula library. Tap 🧮 next to a formula to solve it for any variable with step-by-step working.
| Name | Formula | Note |
|---|---|---|
| Area | A = ¼ √(5(5 + 2√5)) a² ≈ 1.720 a² | |
| Perimeter | P = 5a 🧮 Solve step by step | |
| Interior angle | 108° |
What the letters mean
| a | side |
Formulas assume a regular pentagon (all sides and angles equal).
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