I need this information for a court date that is coming up April 12th. They are trying to prove that the speed-o on my car was wrong due to the size of the rims or whatever compared to stock size. I cant get the information due to not having the car in my posession... I cant have it calibrated. Thanks ahead of time.
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With a known radius, what is the forumula to compute the circumfrence of a circle.

Known radius, 15" and 19"
7.5 and 9.5


3.14xRxR right??? or what?