Packing circles in a square shape is rather a complex question (see //en.wikipedia.org/wiki/Circle_packing_in_a_square , for example). It is even more difficult is the square foot area is not a regular shape.
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81 sq ft = 7.525 sq meters
1 foot = 12" a square foot is 12" x 12" therefore: 1 sq/ft = 144 sq/in
There are: 225*pi sq feet
479 sq foot = 44.5 sq mtr (rounded)
It's a small room! 25 sq ft = 2.32 sq meters