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321. The lanes on the circular outdoor track are one meter wide. By running in the lane next to the innermost lane, Corey ran extra distance in an eight-lap race. How much

User Roxana
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Length of first (inside) lane = 2πr
Length of second lane = 2π(r+1) = 2πr + 2π
8(2π) = 16π units
User Latinos
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