None.
A foot is a measure of length or distance, not area. Distance and area are two different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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13 x 13 = 169 square feet
156 square feet.
39 square feet. this is 1/2 * 13 * 6
There are 65 square feet in an area measuring 5 feet x 13 feet.
Using 3.14 as Pi the area of circle is: 530.66