SOLUTION: The equation x2 + y2 = 4 900 represents the circle formed by the inner lane of a circular running track where all measurements are expressed in foot measure. If an athlete needs

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Question 1171630: The equation x2 + y2 = 4 900 represents the circle formed by the inner
lane of a circular running track where all measurements are expressed
in foot measure. If an athlete needs to run around the track's middle
lane twice, then approximately how many feet will he cover?

Answer by math_helper(2461)   (Show Source): You can put this solution on YOUR website!



Here is a hint:  the equation of a circle is  



and the circumference of a circle is 





Find r and then compute the circumference, and then double that for the two laps.  



 

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