Angles of Polygons
by Anonymous
Change the number of sides to split a polygon into triangles and find the interior angle sum, then see the exterior angles always total 360°.
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About this app
An interactive middle-school geometry app for exploring the sums of polygon interior and exterior angles. Change the number of sides to see a polygon divided into n−2 triangles and calculate its interior-angle sum with 180°×(n−2). A separate exploration shows that exterior angles always total 360°, while the challenge section tests interior sums and the exterior angle of regular polygons.
Use cases
- Middle-school students learning polygon angle formulas
- Teachers demonstrating triangle decomposition with visuals
- Learners practicing interior-angle sum calculations
- Students reviewing regular-polygon exterior angles
- Self-study with short multiple-choice challenges
Features
- Adjustable side count with polygon diagrams
- Visual triangle decomposition for interior-angle sums
- Calculations using 180°×(n−2)
- Exterior-angle exploration showing a constant 360° total
- Multiple-choice challenge missions with answer feedback
- Progressive missions and correct-answer streak tracking