the formula we will sue is for calculating the surface area of a tube is: 2 x x x radius x length.

measure the radius (easiest way to do this is to measure the diameter (the distance across the opening of the tube) and divide in half). include units (cm or in)=
measure the length of the tube you used from top to bottom. include units (cm or in) =
let's simplify x as 3, and plug in your values. your equation becomes 2 x 3 x radius x length
using the equation in step 3, what is the surface area of your small intestine? units will be in unit squared (ex: cm^2 or in^2) )
large folds of your small intestine increase the surface area by three times.
the small folds, villi, increase the surface area further by another ten times. what is the final surface area of your small intestine?