18 feet x 3 feet = 54 square feet
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234 square feet (18 x 13 = 234)/
An 18x18 square is equivalent to 324 square feet. This is calculated by multiplying the length (18 feet) by the width (18 feet) to get the total square footage.
A simple rectangular room 20 feet by 18 feet has 360 square feet.
A 6 foot by 3 foot area would be 18 square feet.
There are 20.5/12 times 18 = 30.75 square feet