First divide the diameter by 2, to get the radius. Then use the formula area = pi x radius2.
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3.5 x 3.5 x 3.1416 ....
The area of a circle with a 7-foot diameter is: 38.48 square feet.
The circumference is about 22 units.
Diameter = Radius*2 = 14 units. Circumference = pi*Diameter = 43.98 units.
If you mean area of a circle then it is: pi times 3.5 squared = 38.485 square units rounded to 3 decimal places