Question 1052752
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Area of the brick path A = {{{pi*R^2-pi^r^2}}} = {{{pi*(9^2-5^2)}}} = {{{pi*(81-25)}}} = {{{3.14*56}}} = 175.84 sq.ft (approximately).


The number of bricks = {{{175/84/2}}} =~ 88.


<U>Answer</U>.  88 bricks.