This question has no meaningful answer.
Firstly, 9by30by2 is a cubic measure - a measure of a volume, in 3 dimensions. Square feet are a 2-dimensional measure of area. Basic dimensional analysis teaches that you cannot convert a 3-d measure to a 2-d measure without additional information.
In any case, the units for 9by30by2 are not given. Are they feet, metres, miles, nanometres or lighyears?
how many square feet in 25 feet by 6 feet
10279 square feet.
How many square feet are in the world?
2178 square feet.2178 square feet.2178 square feet.2178 square feet.
About 430.5 square feet. (430.556417 square feet)
96 square feet
3.472 square feet.
About 1,400 square feet. (1,399.30835 square feet).
7500 square feet
171 square feet.
12.36 square feet
10800 square feet