Geometry

Question Analysis:
This question involves finding the number of sides of a polygon given the sum of its interior angles.
The main focus is reversing the interior angle sum formula to solve for n.

Key Concept Explanation:
The formula for the sum of the interior angles is:
Sum = (n - 2) × 180
Solving for n involves isolating the variable.

Step-by-Step Solution:
Given:
(n - 2) × 180 = 1980
Divide both sides by 180:
n - 2 = 11
n = 13

Common Mistakes: