Geometry

Question Analysis:
This question rewrites a standard formula using diameter.
The main focus is recognizing how to substitute radius.

Key Concept Explanation:
Lateral area = 2πrh, and since d = 2r, replace 2r with d.

Step-by-Step Solution:
2πrh = π × (2r) × h = πdh

Common Mistakes:
Using d² instead of d
Mixin...