Question 112332
The equation {{{A=3.14(15)^2}}} represents the area of the <b>whole</b> circle. We only want half of the circle. So divide the total area by 2 to get {{{A=3.14(15)^2/2}}}



{{{A=3.14(15)^2/2}}} Start with the given equation



{{{A=3.14(225)/2}}} Square 15 to get 225



{{{A=706.5/2}}} Multiply 3.14 and 225 to get 706.5



{{{A=353.25}}} Divide



So the area of the semicircular window is 353.25 sq in



Now multiply 353.25 by 0.85 to find out how much it will cost to coat the window



{{{353.25*0.85=300.2625}}} 



So it will cost around $300.26 to coat the window