To calculate the area of a room, multiply the length by the width. For a 9x20 room, the area is 9 feet multiplied by 20 feet, which equals 180 square feet. Thus, the room is 180 square feet in size.
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87.75 square inches
A 48ft by 10ft room is 480 square feet
1000 square feet
300 square feet
140 sq. ft.