Regular Incircle Polygon Calculator: Area, Perimeter & Side Length

Calculate Regular Polygon Properties from Incircle Radius

Enter the radius of the incircle (apothem) of the polygon.
Enter the total number of sides of the regular polygon (must be 3 or more).

Unlock the properties of any regular polygon using its incircle radius (apothem) and number of sides. Our Regular Incircle Polygon Calculator swiftly computes side length, perimeter, and area, simplifying complex geometry problems instantly. Perfect for students and professionals alike, this tool provides accurate geometric insights.

Formula:

To calculate the properties of a regular polygon given its incircle radius r (also known as the apothem) and the number of sides n, we use the following formulas:

  • Side Length (s): s = 2 * r * tan(π/n)
  • Perimeter (P): P = n * s
  • Area (A): A = n * r2 * tan(π/n)
  • Central Angle (θ): θ = 360° / n

Where:

  • r is the incircle radius (apothem)
  • n is the number of sides
  • π is Pi (approximately 3.14159)
  • tan is the tangent function

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