±Free
Regular polygon
Find area, perimeter, apothem and interior angle from equal side length.
Enter the number of sides and their common positive length. The tool derives the apothem from tan(π/n), then calculates perimeter, area and the angle inside each vertex.
How to use
- Enter your text, values, or image.
- Adjust the options and run the tool.
- Copy or download your result.
Worked example
Example input
Number of sides: 4 Side length: 2
Example result
{
"area": 4,
"perimeter": 8,
"apothem": 1,
"interiorAngle": 90
}Limitations and details
The side count must be an integer from 3 to 10000; formulas assume equal sides and equal angles, not an arbitrary polygon.
Inputs and options
- Number of sides
- Number · Minimum: 3 · Maximum: 10000
- Side length
- Number
Frequently asked questions
Is this tool free and private?
Yes. All 300 tools are free in this phase. Processing happens in your browser; your input and files are not sent to our servers.