% CIRINERT(A,B) calculates the cross sectional moment of interia for
% a pipe cross section
% A = outer diameter, B = inner diameter
%
% To evalutate a filled circle set B = 0
%
%By Roger Cortesi (Course 2 Class of 1999) for 2.007
function [val] = cirinert(a,b)

val = (pi*(a^4-b^4))/64;