From: Erwin Morales <erwin@welma.ca>
To: Teacher2Teacher Public Discussion
Date: 2009052419:12:04
Subject: Re: question on finding arch length


the form is 

            b= r-1/2  4r2 -c2


Where b is the point you looking for  
      r is the radius 
      c the base 

the form is radius minus 1/2 square root of 4xC exponent2 minus 
C exponent2

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