Question 1190708
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As the problem is worded, I assume, based on the context, that the question is about the area 
of the horizontal cross-section of the concrete wall, and not about the area of the wall itself.



With enough precision, the area of the horizontal cross-section is the product of the circumference 
by the wall thickness, both expressed in centimeters


    the area of the horizontal cross-section = {{{100*(22/7)*100*2}}} = {{{20000*(22/7)}}} = 62857 cm^2.    <U>ANSWER</U>
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Solved. &nbsp;&nbsp;&nbsp;&nbsp;//  &nbsp;&nbsp;&nbsp;&nbsp;Notice that &nbsp;22/7 &nbsp;is a rational approximation for &nbsp;{{{pi}}}.