Geometry

Question Analysis:
This question involves calculating surface area when given diameter instead of radius.
The main focus is on proper conversion between diameter and radius in area formulas.

Key Concept Explanation:
Total Surface Area (TSA) requires radius:
r = diameter/2
TSA = 2πr(h + r)

Step-by-Step Solution:
Convert diameter to radius: 6 cm ÷ 2 = 3 cm
Apply TSA formula: 2π × 3 × (15 + 3)
Calculate parentheses: 15 + 3 = 18
Multiply: 2 × 3 × 18 = 108
Final answer: 108π cm²

Common Mistakes:<...