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19wohlvic
so you are talking about circumference which is 2pie r 

so 4 1/4 = 2pier 
divide by 2 
2 1/8= pie r
divide by pie
r=.67*2
the length is 1.35
1 mile=5280 feet, 4 1/4 miles=4.25 miles

1 mile:5280 feet
4.25 mile:?feet
4.25×5280÷1=22440 feet. As a result, 4 1/4 miles equal 22440 feet. Hope if help!

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