Answer:
Step-by-step explanation:
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Your right on both of your answers to number 1 and 2
3,503,832.97 hope this helps! :)
If the shape of the room is a square, then the square root of the sum of the squares of the the two adjacent sides will give the diagonal.
i.e.

Since the square root of the sum of the squares of the the two adjacent sides is 24.04 and not 18.79, therefore, the shape of the room is not a square.
Answer:
I have attached the work to your problem.
Please see the attachment below.
I hope this helps.