20 square feet.
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2.5 square feet.
The average front door is 36in. or 3 feet. ADA standards require at least 32 inches for handicapped access.
154 square feet.
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.
10279 square feet.