Question

A cylindrical piece of iron pipe is shown below. The wall of the pipe is 1.25 inch thick:
What is the approximate inside volume of the pipe?

88 cubic inches
49 cubic inches
142 cubic inches
154 cubic inches

Answer 1

whats this assignment called maybe i can go on quizzez and find the awnser

Answer 2

Which ones do you think we can eliminate?

Answer 3

@theyadoreshayyy you there?

Answer 4

Oh she offline :/.

Answer 5

there are 2 walls right? the left, and the right side one.

thats why we multiply 1.25 inch by 2:
\[ 2 \times 1.25 = 2.5 in \]

lets find the diameter of the base of the smaller circle
\( 6-2.5=3.5 \)

that means the radi of the smaller circle is \[ \frac{3.5}{2}\Rightarrow r=1.75 \]

now lets just find the volume of it just like we would normaly do:
\[ V= \pi r^2 \times h \]
\[ V= \pi \times 1.75^2 \times 16 \]
\[ V= \pi \times 3.0625 \times 16 \]
\[ V= \pi \times 49 \]
\[ V\approx 154 \ in^3 \]