Does this work for irregular polygons?
No. The formulas assume every side and angle is identical. For irregular polygons use coordinate-based area methods instead.
Step-by-step walkthrough
Polygon Area Calculator Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- regular polygon
- area
- perimeter
Detailed procedure
Step 1
Enter how many equal sides the polygon has (triangle = 3, hexagon = 6, etc.).
Step 2
Provide the side length using any unit.
Step 3
Review area, perimeter, apothem, circumradius, and the interior/exterior angles.
Teaching & troubleshooting tips
Can I enter radius instead of side length?
This tool expects side length. Convert radius to side length first using s = 2r · sin(π/n) if needed.