Educational worksheet for calculating interior and exterior angles of regular polygons.

Worksheet titled "Angles in Regular Polygons" showing a diagram of a polygon with interior and exterior angles, formulas to complete, and a table for calculating angles based on the number of sides.

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- Sum of exterior angles = 360°
- Interior angle + Exterior angle = 180°
- Exterior angle = 360° ÷ n
- Sum of interior angles = 180° x (n - 2)

| n (number of sides) | Exterior Angle | Interior Angle | Sum of Interior Angles |
| :--- | :--- | :--- | :--- |
| 3 | 120° | 60° | 180° |
| 6 | 60° | 120° | 720° |
| 20 | 18° | 162° | 3240° |
| 9 | 40° | 140° | 1260° |
| 8 | 45° | 135° | 1080° |
| 5 | 72° | 108° | 540° |
| 12 | 30° | 150° | 1800° |
| 4 | 90° | 90° | 360° |
| 10 | 36° | 144° | 1440° |
| 15 | 24° | 156° | 2340° |

Parent Tip: Review the logic above to help your child master the concept of sum of interior angles worksheet.

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