Please Helpppp!!! Mother having a hard time with radicals.

Question

A playground is shaped like a rectangle with a width 5 times its length (l). What is a simplified expression for the distance between opposite corners of the playground? Please can you post step-by-step so I understand what I am grading

Answer 1

length --- l
width ---- 5l

distance^2 = (5l)^2 + l^2 = 26l^2

distance = √26 l

Answer 2

Thanks Reiny, I appreciate the steps. :)