A lineal or linear foot is the same as a foot so a 16 feet diameter is the same as a diameter of 16 lineal feet.
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The area is 50.27 square feet.
It is 50.3 feet.
There are: 16*pi square feet
There are two ways to answer your question. If you mean the circle is 16 feet wide (diameter), then the square footage is 201.06 square feet. However, if you mean the circle is 16 feet around (circumference), the square footage will be 20.372 square feet.
The circumference of a circle with a diameter of 16 km is: 50.3 km