SOLUTION: tire radius of 21 in profile 12in what is surface area 20 % making contact

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Question 965233: tire radius of 21 in profile 12in what is surface area 20 % making contact
Answer by Alan3354(69443) About Me  (Show Source):
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tire radius of 21 in profile 12in what is surface area 20 % making contact
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It's a cylinder
SA+=+pi%2Ar%5E2%2Ah+=+pi%2A441%2A12+=+16625 sq inches
20% of that = 3325 sq inches
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It's not likely that a tire on any vehicle has 20% of its surface in contact with the ground.
If you meant 20 degrees,
16625*20/360 = 924 sq inches