The diameter of a cylinder construction pipe is 4ft. If the pipe is 21ft long, what is the volume?

263.76 cu. ft.

Step-by-step explanation:

For a pipe use its length instead of height: pipe volume = π * radius² * length, where radius = inner diameter/2.

Volume = pi x r^2 x l

= 3.14 x 4 x 21

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.