<PRE><B>Question 550961</B>
the perimeter of a square is 72. Express the length of a diagonal of the square in simplest radical form.

----
Each side is 72/4 = 18
----
Use Pythagoras to get:
diag^2 = 18^2 + 18^2
---
diag^2 = 2*18^2
---
diag = 18*sqrt(2)
========================
Cheers,
Stan H.</PRE>