Question 73616
The area of the semicircular window is half of what the area would be if the window were a whole circle. The area is thus {{{(1/2)*p*r^2}}} = {{{(1/2)*p*15^2}}} = {{{(1/2)*p*225}}}. Replace p with 3.14 and the area of the semicircle = {{{(225/2)*3.14}}} = {{{112.5*3.14}}} = 353.25 square inches. The cost per square inch = $0.85 so the total cost = {{{353.25*.85}}} = ${{{highlight(300.26)}}}.