20 inches = 20/12 ft = 1.67ft
6 inches = 6/12 ft = 0.5ft
1.67X0.5 ft = 0.83 sq ft.
Therefore 900sq ft / 0.83 sq ft = 1080 tiles
However the above answer is how much is needed without waste. I.e. no partial tiles for the perimeter.
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a 12 x 2 inch square tile is 1 foot by foot = 1 sq ft you need 252 tiles
A square
A square based pyramid has 12 angles
there is 5
it has one how old are you if you are that dum