Geometry

Question Analysis:
This question tests knowledge of exterior angles in regular polygons, specifically a decagon (10-sided polygon).

Key Concept Explanation:
- All regular polygons have equal exterior angles.
- The sum of exterior angles for any polygon is always 360°.
- For a regular decagon (10 sides), each exterior angle = 360° ÷ 10.

Step-by-Step Solution:
1. Number of sides (n) in a decagon = 10
2. Sum of exterior angles = 360°
3. Each exterior angle = 360° ÷ 10 = 36°

Common Mistakes:
- Dividing 360° by wrong number of sides (e.g., using 8 for octagon instead of 10)
- Confusing e...