Geometry

Question Analysis:
This question requires solving for the number of sides using the measure of a regular interior angle.
The main focus is algebraically solving the interior angle formula.

Key Concept Explanation:
Each interior angle = [(n - 2) × 180] / n
We are solving for n when the interior angle = 156°

Step-by-Step Solution:
Set up the equation:
[(n - 2) × 180] / n = 156
Multiply both sides by n:
180(n - 2) = 156n
180n - 360 = 156n
24n = 360
n = 15

Common Mistakes:
Incorrect algebr...