What you provide
What you provide
- Number of sides, using the same scenario as the other inputs
- Side length expressed in units, using the same scenario as the other inputs
MATH / PLANE GEOMETRY
Regular Polygon Apothem Calculator
Calculate apothem, circumradius, and perimeter of a regular polygon. Review the equation, substituted values, result, assumptions, and interpretation in one focused workspace.
- 01 Calculated in this tab
- 02 Values stay in this browser tab
- 03 Use boundary
Use boundary
Calculation path
Calculate apothem, circumradius, and perimeter of a regular polygon. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.
Calculation path
a=s/[2 tan(180/n)]
What you receive
What you receive
- Apothem in units from the stated equation
- A symbolic formula plus substituted working with your values
- Visible assumptions, field guidance, and an authoritative learning reference
Use boundary
Choose the maximum decimal places shown. This does not increase source accuracy.
All sides and central angles are equal.
Use internally consistent units and retain extra precision when carrying the result into another calculation.
Reviewed reference factors