how to get the square foot of a 10'' pipe 20' long?

Answer 1

If you desire the external surface area of the pipe,

A = pi*d*L

Make sure d & L are in the same units and your answer will be in those units squared.

If you are looking for the internal cross sectional area:

Ac = (pi*d^2)/4

Answer 2

You mean square footage?

Cylinder, d=10/12 of a foot, h = 20 feet. Use the formula for the surface area.

Answer 3

If what you want it how many square feet in the surface area of the pipe, you would divide 10" by 12 to get the diameter in feet, then multiply it times pi (3.1415926) then multiply that by the length. Your answer would be: 52.3598775598 square feet.

I really don't know why you would want to do that, though.

If what you want is the VOLUME in cubic feet of the pipe, you would have to convert the 10" into feet, divide by 2 to get the radius, square that and multiply by pi, then by the length.

That answer would be: 10.908307828 cubic feet.

Answer 4

A=c*l
d=10", c=10*π
A=240"*10"*π=7539.8in^2=52.36ft^2

Answer 5

c=2(pi)r = 31.4"
l=20 ft = 240 ''
cylindar c=2(pi)r

Area = c*l =7536 in^2
qed

Maybe he wants to paint the outside.

Answer 6

just square it or sqaure root it ! sike i dunno.