Geometry

Question Analysis
This question requires calculating the volume of a cone and then finding half of that volume, since the tank is only partially full.
The main focus is on volume calculation with a proportional adjustment based on real-world context.

Key Concept Explanation
The volume of a cone is given by the formula:

where:
is the radius of the base
is the height of the cone
is approximately 3.1416 or can be left as π in terms of exact value
Then, multiply the result by to represent "half full".

Step-by-Step Solution
Given:
Radius ft
Height ft
Step 1: Find full volume