Answer: 
Step-by-step explanation:
Given
The area of the square is 
Suppose a is the side length of the square
The area of the square is given by

So, we can write

length of each side is 
Answer:
There isn't a solution. :(
Step-by-step explanation:
Sounds like a good deal to go swimming!
Pythagoras
28^2-19^2= 423
Square root of 423 = 20.5669638
Answer = 20.5669638