Question 310945
Cost per sq inch is .85

We know Area of a circle = Pi x r^2 where r is the radius
Pi= 3.14
Radius= 10

Area of the circle= Pi x r^2
= 3.14 x 10^2
= 3.14 x 100
= 314

The given window is semicircular in shape, hence its area will be half the area of the above circle
= 314 / 2
= 157 sq inches

Hence cost of coating the window will be  157 x .85 = 133.45