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Decagon Area Calculator
Area, perimeter and apothem of a regular decagon from its side length.
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Area
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Area, perimeter and apothem of a regular decagon from its side length.
Decagon Area Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: A = (5/2) s2 sqrt(5 + 2 sqrt5).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Decagon Quick Guide
Typical values for reference.
| Side | Area | Perimeter | |
|---|---|---|---|
| 1 | 7.694 | 10 | |
| 3 | 69.248 | 30 | |
| 5 | 192.355 | 50 | |
| 10 | 769.421 | 100 | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Decagon Area Calculator FAQ
Answers to common questions about this calculator.
A polygon with ten sides.
About 7.694 times the side squared.
144 degrees.
The distance from the centre to a side.