The answer depends on the units of measurement used for the numbers in the question: feet, metres, centimetres, miles, etc.
90
Assuming 9x9 is also in feet, then answer is 81 square feet.
141.75
How many squares fit in a 9 ft by 9ft by 8
81 square feet. 9x9 You provided the vertical dimensions, so perhaps you are also looking for cubic feet- 810 9x9x10
If it is nine feet by nine feet, then it is 81 square feet.
Multiply the two dimensions to get the area. The calculation will give you 81 square feet.
16 if there is no wastage or cutting.
To turn a 9x9 square into an octagon you can cut corners off the square. It will not be a regular octagon though.
81
Each tile covers 81 square inches. You have 1,296 square inches to cover. It will take 16 tiles to cover that area.
81 (9x9) & 9 (3x3)