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First divide the perimeter by 2 then subtract the diagonal from this. The number left with must equal two numbers that when squared and added together equals the diagonal when squared (Pythagoras' theorem) These numbers will then be the length and height of the rectangle.
Add the two numbers and divide that by two.
49- 16 = 33. 49is 7 squared, and 16 is 4 squared.
You divide decimals like you normally would divide two numbers. Just make sure your decimals get in the right spot and your good! :)
1 and 36 is one of two possible pairs -> so the squared numbers are 12 and 62