The problem:
This problem was originally multiple choice, but now all of the answers except for the one I chose are hidden.
To analyze the buckling load for slender columns, the Euler’s equation is used: Fb = (n * π^2 * E * A) / (L / r)^2 where :
Fb =Buckling Load, lbs E = modulus of elasticity, 3.00E+07 lb/square in
A = cross sectional area, 7.33 square inches L = length of column, inches
r = least radius of gyration, 3.19 inches n = 4 if both ends are fixed
Using the information above & the sample Excel Spreadsheet below, select the input formula that would be needed for calculating the Buckling Load in pounds using cell locations and a beam length of 25 feet from one of the following answers shown below:
9643accc-4d5d-4416-9188-97243cd5108b.png
My answer
=(B7*pi()^2*B3*B4)/(B6/B5)^2

This was incorrect, but I can't figure out why. All of the answers looked pretty similar. What do you think I did wrong?