Question

I am very lost right now and could use any help!! Please help me out on this I have an attached file too.
Here is the question. Find the Total Area for a reqular Pyramid.
I have the anwser but they want the anwser in a square root form and I cannot get to that form!!! :(

Answer 1

ta=1/2pl+B
ta=(1/2)(400)(4)
ta=(200)(4)
ta=800

if you would like to see the entire problem (how I found the ta let me know)