Regular Polygon
GEOMETRY
Regular Polygon
Find area, perimeter and apothem of a regular polygon.
UNDERSTAND YOUR RESULT
How it works
Find area, perimeter and apothem of a regular polygon.
THE CALCULATIONarea = n × side² / (4 tan(π/n))
Using this calculator
Enter side length, number of sides. area = n × side² / (4 tan(π/n)).
What to keep in mind
Use the same length unit for all lengths. Areas use squared units and volumes use cubed units. Diagrams are not to scale; inputs must satisfy the shape’s geometry.
Frequently asked questions
Are my entries saved?
No. Calculator inputs remain in the current page and are cleared when you reload or leave. The tools do not upload your entries.
Why are results rounded?
The display is rounded for readability. Calculations use unrounded intermediate values. An estimate should not be interpreted as an exact measurement.