None. A 12 foot diameter is the length across a circle: it is a linear distance, not an area.
3.14159265 square feet.
8011.846665 or 8012 square feet to the nearest square foot
615.75
12.56
Approx 490.9 sq feet.
153.93804 square feet.
3.14159265 square feet.
803.84 feet
8011.846665 or 8012 square feet to the nearest square foot
450
132.73
346
1590.4
176.625
2512
102.05
12.56