Decagon Area Calculator
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Decagon Area Calculator — free online calculator.
Formula
Regular decagon area = 10 × side² / (4 × tan(π/10)).
- Enter the geometric dimensions indicated below. Dimensions must use compatible units; the output is an area in squared units unless otherwise stated.
- The main inputs are Side length. Enter them in the units and format shown in the calculator.
- Keep comparable quantities in compatible units whenever the formula combines or compares them.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Decagon Area
Inputs
- Side length: 5
Example inputs: Side length = 5. Calculated result: Area: 192.3552 square units.
Sample result: Calculating…
Frequently asked questions
What does the Decagon Area calculate?
This formula applies to a regular decagon with ten equal sides.
Which values should I enter?
Enter Side length using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Regular decagon area = 10 × side² / (4 × tan(π/10))..
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.