Question

What's the volume of a pipe at a port that is 4 feet in diameter 24 ft long

Answer 1

answer: D

explanation:

volume is equal to length * surface area.

surface of a tube base is a circle, so it' surface are can be calculated as:

$\pi \: {r}^{2}$

where r is a radius

$r \: = \frac{1}{2} diameter$

so you calculate volume V as:

$v \: = \pi( {r}^{2} ) \times length \: = \pi \times \frac{1}{4} \times {diameter}^{2} \times length$

$v = 3.14 \times \frac{1}{4} \times 4 \times 4 \times 24 = 301.44$

so the answer is D