When the length and width of the room are equal to 40 feet. In this way, you will have 40 x 40 equal 1,600 square feet.
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A simple rectangular room 20 feet by 18 feet has 360 square feet.
A 10x14 room has an area of 140 square feet (10 feet x 14 feet = 140 square feet).
The area of a 12x10 room is 120 square feet.
The room has a total of 352 square feet (22 x 16 = 352).
A 10x13 room would have 130 square feet. This is calculated by multiplying the length (10 feet) by the width (13 feet) of the room to find the total square footage.