We have, Diameter of a semicircular window is 24 inches. Radius of window is 12 inches. Lou wants to insert a laminated sun-block coating that costs $1.50 per square inch to apply. It means we need to find the area of semicircular window. IT is given by :
Cost per square inch is $1.50. So, Lou spend to coat the window with sun-block is
So, Lou spend to coat the window with sun-block is $339.12.
Significant figures are numbers after the decimal point, which have usually been rounded. There are four numbers after the decimal point, so there are 4 significant figures.
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