Got the answer as 861.1 but it says incorrect. The solution video has different number used so unsure of the actual answer.

You need to round the answer to the nearest **ten** (this is not the same as rounding to one decimal place).

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Hello,

We can achieve maximum area by a square when the perimeter is fixed. So 104 feet should be in a square which gives us a side of 26ft. So it will be 676 sq.ft. or maybe 680 sqft

I am not sure why he is asking for rounding of the answer. Maybe its a trap.

Thanks

Because to allow for precision errors (and so that the answer doesn’t change whether you take \pi = 3.14 or \pi = 22/7).