Area = pi x r2. So assuming you mean you have a 2ft diameter circle, the radius would be 1 foot. So pi x 1 x 1 = 3.14 square feet.
314.16 sq. ft.
16 foot circle = 110.48 sq. feet
8,758,257,663 sq ft
314.16 sq. ft.
the sq. footage of the circle would be 3.14(radius squared). if the diameter is 200ft, then the radius is 100ft. So, 3.14(100x100)= 3.14(10,000)= 31,400 sq. feet
Area = pi*r2 = pi*4.52 = 63.62 sq feet (to 2 dp)
If it's a circle, around 1017.88 square feet.
Approx 154 sq feet.
A=3.14x5x5=78.5 sq. ft.
radius = diameter ÷ 2 area = π × radius² = π × (diameter ÷ 2)² = π × (141 ÷ 2)² = 4970¼ π sq ft ≈ 15614.5 sq ft
2.25pi feet squared or 7.068583471 sq. feet
28 foot diameter A = 3.14 x 142 = 615.44 sq ft