First, you need to know the dimensions of the door. Suppose it's 80 inches tall (6 2/3 ft) by 36 inches wide (3 ft). So (6 2/3 ft) X (3 ft) = 20 square feet.
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20 square feet.
how many square feet in 25 feet by 6 feet
10279 square feet.
How many square feet are in the world?
About 430.5 square feet. (430.556417 square feet)