SOLUTION: A semicircular window of radius 10 inches is to be laminated with a sunblock coating that costs $0.85 per square inch to apply. What is the total cost of coating the window, to the

Algebra ->  Circles -> SOLUTION: A semicircular window of radius 10 inches is to be laminated with a sunblock coating that costs $0.85 per square inch to apply. What is the total cost of coating the window, to the      Log On


   

Question 323420: A semicircular window of radius 10 inches is to be laminated with a sunblock coating that costs $0.85 per square inch to apply. What is the total cost of coating the window, to the nearest cent? (Use п = 3.14. Hint: Area of Circle: A = пr2)
I am not sure how to do this problem
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
a=pir^2
a=3.14(10)^2
a=3.14*100
a=314 area of the circle.
You only have half a circle.
314/2=157 in^2 is the area to cover.
157*.85=$133.45 is the cost of the sunblock coating.