Geometry

Question Analysis:
This question involves using the polygon interior angle sum formula in reverse.
The main focus is on recognizing and applying the formula for interior angles to find the number of sides.

Key Concept Explanation:
The sum of the interior angles of an n-sided polygon is:
S = (n − 2) × 180

Step-by-Step Solution:
We are given:
Sum of interior angles = 3060°
So, (n − 2) × 180 = 3060
→ Divide both sides by 180:
n − 2 = 3060 ÷ 180 = 17
→ n = 17 + 2 = 19

Common Mistakes:
Forgetting to add 2 after dividing by 180
Using the formula ...