*
*on a 30 X 80 building.

(1) Take the length of your building and multiply it by itself. (80 x 80=6400)

(2) Take the width of your building and multiply it by itself. (30 x 30=900)

(3) Add the two numbers together.
(6400 + 900=7300)

(4) Type that number into your calculator and hit "square root" (85.4)

(5) That number is how many feet your building should measure criss-cross.

It's simple. You can do it!