Posted by **daisy** on Tuesday, March 1, 2011 at 8:43pm.

a circular track has a radius of 100ft. elena wants to run 2 miles. There are 5,280 ft in a mile.

Can you find the circumference of a circle if you know the radius? explain your answer

- math -
**Helper**, Tuesday, March 1, 2011 at 9:35pm
Circumference, C = 2 pi r

or, C = pi d

C = 2 pi r

C = 2(3.24)(100)

C = 628 feet for one lap

5280 * 2 miles = 10,560 feet

10560/628 = ? = laps in 2 mile

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