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A perfect dome (1/2 of a sphere) has a surface area of 2piR2. This is because a sphere's surface area is 4piR2, and dividing that by 2 would simplify to 2piR2.
The surface area of a sphere is 4(3.14)R2where R is the radius of the sphere so the surface area of your dome is half of that. 2(314)R2
You need dome type of Formula to calculate this. The formula must relate drag and surface area. Assuming the surface area is at the face of the car, or not.
It is the surface area of the two ends plus the surface area of the curved surface. Surface area of each end is pir2 Surface area of the curved surface is 2pirh Total surface area = 2pir2 + 2pirh
To obtain the ratio of surface area to volume, divide the surface area by the volume.