Multiply the dimensions. 9x10 is 90 square feet.
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You do NOT specify the units of '9' nor' '10' . However, assuming you mean 9 feet x 10 feet , the the area is to multiply these two numbder together.
Hence
9ft x 10 ft = 90 sq.ft.
240 square feet
300 square feet.
162 square feet.
There are 270 square feet in a 15'x18' room.
192 square feet.