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To find the volume of the cylindrical pipe, we will calculate the volume of the outer cylinder and subtract the volume of the inner cylinder (since the pipe is hollow).

### Formula for volume of a cylinder:
\[
V = \pi r^2 h
\]
where:
- \(r\) is the radius,
- \(h\) is the height,
- \(\pi\) is approximately 3.14159.

### Given:
- Height \(h = 4 \, \text{m}\),
- Outer diameter = 4 m → Outer radius \(r_{\text{outer}} = 2 \, \text{m}\),
- Inner diameter = 3 m → Inner radius \(r_{\text{inner}} = 1.5 \, \text{m}\).

### Steps:
1. Calculate the volume of the outer cylinder using \(r_{\text{outer}} = 2 \, \text{m}\).
2. Calculate the volume of the inner (hollow) cylinder using \(r_{\text{inner}} = 1.5 \, \text{m}\).
3. Subtract the volume of the inner cylinder from the outer cylinder to get the volume of the pipe.

Let's compute this.The volume of the cylindrical pipe is approximately **21.99 cubic meters**, rounded to two decimal places.

Would you like more details or have any questions? 

Here are five related questions to consider:
1. How would the volume change if the pipe's height increased to 6 meters?
2. What would happen if the outer diameter decreased to 3.5 meters?
3. How would you calculate the surface area of the pipe's outer surface?
4. How is the volume affected by changing the inner radius only?
5. How would the formula change if the pipe was filled with water instead of being hollow?

**Tip**: Always ensure to double-check units when dealing with volume, surface area, or other measurements to avoid mistakes.

Find the volume of this 4 m tall cylindrical pipe, whose outside diameter is 4 m and inside diameter is 3 m. Round the answer to 2 decimal places.

This guide explains how to calculate the volume of a 4-meter tall cylindrical pipe with an outer diameter of 4 meters and an inner diameter of 3 meters. Learn step-by-step how to apply the formula for the volume of a cylinder and get the answer in cubic meters. Suitable for students in Grades 7-9.

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