document.write( "Question 1171630: The equation x2 + y2 = 4 900 represents the circle formed by the inner
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Algebra.Com's Answer #796535 by math_helper(2461) $\"\"$ $\"About$

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document.write( "Here is a hint:  the equation of a circle is  \r
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document.write( "and the circumference of a circle is \r
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document.write( "Find r and then compute the circumference, and then double that for the two laps.  \r
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