If you mean area of a circle then it is: pi times 3.5 squared = 38.485 square units rounded to 3 decimal places
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The area of a circle with a 7-foot diameter is: 38.48 square feet.
The surface area of a sphere with a diameter of 7cm is 153.9cm2
The surface area of a cylinder that has a height of 7 centimeters and a diameter of 8 centimeters is 276.46cm2
First divide the diameter by 2, to get the radius. Then use the formula area = pi x radius2.
Diameter = 14 in Area = 153.86 in2