Question 1197552
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Hi 
 *[illustration circle.jpg].
A = {{{pi*r[0]^2 - pi*r[i]^2 = pi(25^2 -20^2) = 225pi }}}
At $1.50/ft^2, the cost of constructing the walk:  {{{1.50(225*pi)}}} = $1060 rounded
Wish You the Best in your Studies.
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