1. Enter the number of sides of your regular polygon (e.g., 3 for a triangle, 4 for a square, 5 for a pentagon) into the input field.
2. Click the "Calculate Angle" button.
3. The calculated interior angle will be displayed, along with a visual representation of the polygon and a step-by-step explanation of the calculation.
4. If you enter an invalid number (less than 3 sides), an error message will appear.