By multiplying its length to its width.
Area= length x width
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well you multiply 150 times 3.99
To calculate square footage, you multiply the length by the width of the room. So, if the room measures 10 ft. by 18 ft., your total area is 180 sq. ft.
There are: 4.5 ft × 6 ft = 27 sq ft on the floor and top of the closet; 4.5 ft × 9 ft = 40.5 sq ft on the two sides; and 6 ft × 9 ft = 54 sq ft on the front and back. In total there is a surface area of 2 × 27 sq ft + 2 × 40.5 sq ft + 2 × 54 sq ft = 243 sq ft.
there are 144 Sq. in. in 1 sq. foot. Therefore you divide sq. in. by 144 = sq. ft. or sq.in./144=sq.ft.
That's a total of 140 ft2