# I need help!

i have a cylinder that is 2 feet in diameter and 30 feet in length, if it costs \$3.50 per square foot how do i figure out what the approximate total cost is for making this pipe which is open at both ends.

Okay, so you have a few facts. The dimensions of a cylinder, and the cost of a material based on area. You need to find out the total cost of the cylinder. How do you think you could relate those 2 pieces of information?
theo.cushion
02 May 2012
i dont know a thing about this. its geometry work and teacher never went over this with me. i havent been taught this yet, and hes expecting us to know how to do this.
austinjo
02 May 2012
if you can give me the equation i can use and reasoning behind it, i would greatly apreciate it.
austinjo
02 May 2012
i need an equation, and reasoning behind the equation, otherwise it remains unknown what to do. ive tried using the textbook with my mom helping me, and we as a group still cant figure it out, along with other problems on the worksheet.
austinjo
02 May 2012
Imagine a big sheet of paper, 30 feet long and wide enough to wrap around the circumference of the pipe. Now open the sheet out to form a rectangle. You can calculate the area of this rectangle. You just need to work out the width of this paper sheet. It must be possible to use the pipe's diameter to work out this dimension?
ianmoth
02 May 2012