The problem asks to find the exact volume of a cylindrical pipe with radius $r = 4.5$ ft and length $h = 7$ ft. The answer needs to be expressed in terms of $\pi$.

1. Problem Description

The problem asks to find the exact volume of a cylindrical pipe with radius $r = 4.5$ ft and length $h = 7$ ft. The answer needs to be expressed in terms of $\pi$.

2. Solution Steps

The formula for the volume of a cylinder is:

$V = \pi r^2 h$

Substitute the given values into the formula:

$V = \pi (4.5)^2 (7)$

Calculate $(4.5)^2$:

$(4.5)^2 = 4.5 \times 4.5 = 20.25$

Substitute this value back into the volume formula:

$V = \pi (20.25)(7)$

Multiply $20.25$ by $7$:

$20.25 \times 7 = 141.75$

Therefore, the volume is:

$V = 141.75\pi$

3. Final Answer

$141.75\pi$