Question 413017
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Hi
George used 450 feet of fencing to enclose a circular pool. 
He wants to leave a 3-foot walkway around the first fence. 
How many feet of fencing will he need for the second fence?

Note: P[r] = {{{2pi*r}}}
 {{{P[r] = 2pi*r = 450}}}
 {{{P[r+3] = 2pi*(r+3)}}}=2pi*r + 6pi = 450 + 6*3.14 = 468.84