Regular Decagon Area Table: Area by Side length
Reference table of area for Regular Decagon Area across a range of side length values — exact, engine-computed figures you can read off at a glance.
Regular Decagon Area Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Area
769.4209
- Perimeter
- 100.00
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Regular Decagon Area Calculator
The Regular Decagon Area Calculator works out your area, along with 1 related figure in an instant. Enter side length and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the side length.
- Read off your area, together with perimeter — the calculator updates automatically, with no button to press.
Formula
The Regular Decagon Area Calculator uses the formula:
Area = 7.694208843 × (Side length)^(2)
Worked example
For example, with side length of 10, the area is 769.4209.
| Side length | 10 |
|---|
| Area | 769.4209 |
|---|---|
| Perimeter | 100.00 |
Results are estimates for educational use, not professional advice.
Key terms explained
- Perimeter
- The total distance around the outside of a two-dimensional shape.
- Area
- The amount of two-dimensional space a shape covers, measured in square units.
Frequently asked questions
Multiply the side squared by about 7.6942. A decagon with 10-unit sides has an area of roughly 769.42 square units.
A decagon is a polygon with ten sides. A regular decagon has all sides and angles equal.
Each interior angle is 144 degrees, since the ten angles sum to 1440 degrees.
It uses the regular-polygon formula with the cotangent of 180 degrees divided by 10.
The Regular Decagon Area Calculator uses the formula: Area = 7.694208843 × (Side length)^(2). For example, with side length of 10, the area is 769.4209.
Enter the side length. Read off your area, together with perimeter — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Regular Decagon Area: Formula, Steps & Examples
Learn how to calculate Regular Decagon Area — the formula explained step by step, with worked examples and a free calculator to check your answer.