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To find the volume of a cylindrical water tank, we use the formula:

\[
V = \pi r^2 h
\]

where:
- \( V \) is the volume,
- \( r \) is the radius of the cylinder,
- \( h \) is the height of the cylinder.

### Given Data
- Radius \( r = 5.5 \) ft
- Height \( h = 9 \) ft
- Approximate \( \pi \) as 3.14

### Calculation
1. First, calculate \( r^2 \):
   \[
   r^2 = (5.5)^2 = 30.25
   \]

2. Substitute values into the volume formula:
   \[
   V = 3.14 \times 30.25 \times 9
   \]

3. Multiply to find the volume:
   \[
   V = 3.14 \times 30.25 \times 9 = 855.585
   \]

4. Round to the nearest whole number:
   \[
   V \approx 856 \text{ cubic feet}
   \]

### Answer
The volume of the tank is approximately **856 cubic feet**.

Would you like more details, or have any questions?

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Here are 5 related questions to expand your understanding:
1. How would the volume change if the height of the cylinder were doubled?
2. What would happen to the volume if the radius was doubled instead of the height?
3. How is the formula for the volume of a cylinder derived?
4. How would the answer change if we used a more accurate value for \( \pi \)?
5. Can you calculate the surface area of this cylinder?

**Tip:** For all cylinders, doubling the radius increases the volume by a factor of four, while doubling the height doubles the volume.

The radius of a cylindrical water tank is 5.5 ft, and its height is 9 ft. What is the volume of the tank?

Learn how to calculate the volume of a cylindrical water tank with a radius of 5.5 ft and a height of 9 ft using the formula V = πr^2h. This problem demonstrates volume calculation for cylinders, using π ≈ 3.14 and rounding to the nearest whole number. Ideal for students in Grades 7-10.

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