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 Author: Euclid Subject: RE: How long is the outside lane of a 400m track?

Message:

engineering professor wrote:
if the lanes are truly 1m wide, the additional distance is 2*PI*8m which is about 50m.

Slight (and incomplete) correction. Your formula should be 2*pi*(7 + x), not 8m, unless you plan to run in the very outside of lane eight. Here x represents the distance between the inside of lane eight and the imaginary line along which the runner travels, which I believe should be one foot. So 2*pi*7.31m would be very close. I reckon Mark has it right.

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