That would be ...
(242 + 302)-2 = 38.42
(Thank you, Mr Pythagoras)
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32.311
Pythagoras! Diagonal = sqrt (900 + 900) = 42.43'
302+482=3204 squareroot(3204) Answer=56.60388679
Oh, dude, you're hitting me with the math questions now? Okay, okay, let me think. So, the diagonal of a rectangle can be found using the Pythagorean theorem, right? So, it's like the square root of (24 squared + 30 squared). That's like 36 feet. So, the diagonal of a 24 ft by 30 ft rectangle is 36 feet.
There is no such unit of measurement as a diameter, a diameter is the length across something. Perhaps you are thinking of a decimetre.