Geometry

Question Analysis:
This problem tests understanding of regular polygons and their angle properties.
It specifically examines the ability to calculate individual interior angles in a regular five-sided figure.

Key Concept Explanation:
For regular polygons (where all sides and angles are equal), each interior angle can be calculated using [(n - 2) × 180°]/n.
For a pentagon (n = 5), this becomes [(5 - 2) × 180°]/5 = (3 × 180°)/5 = 540°/5 = 108°.

Step-by-Step Solution:
Calculate total angle sum: (5 - 2) × 180° = 540°
Divide by number of angles: 540° ÷ 5 = 108°

Common Mistakes:
Confusing interior with exterior angles is the most frequent error.
Some students might forget to divide by the n...