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Decagon Calculator
Find the side, area, perimeter and radii of a regular decagon from its circumradius.
ruler Free Online Tool
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Side length
Compare Your Options And Get Clear Answers
Find the side, area, perimeter and radii of a regular decagon from its circumradius.
Decagon Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: s = 2R sin(pi/10).
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.
| R | Side | Area | |
|---|---|---|---|
| 1 | 0.618 | 2.939 | |
| 5 | 3.090 | 73.473 | |
| 8 | 4.944 | 188.091 | |
| 10 | 6.180 | 293.893 | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Decagon Calculator FAQ
Answers to common questions about this calculator.
A ten-sided polygon.
Multiply R by 0.618.
Interior 144 degrees, exterior 36.
This tool assumes so.