Question

A semicircular window of radius 12 inches is to be laminated with a sunblock coating that costs $0.80 per square inch to apply. What is the total cost of coating the window, to the nearest cent? (Use p = 3.14. Hint: Area of Circle: A = p r²

Answer 1

Okay, we have the following as given:

We have a semicircle with R = 12 in so:

\[A = 1/2 \pi r^2 = 72\pi\]

Now the other half of the circle also has the same Radius = 12 in
so it'll have the same area, \[A = 1/2 \pi r^2 = 72\pi\]
and so
If 72 pi of the circle ---> costs 0.80
then 72 pi + 72 pi (full circle) ----> x

cross multiply and you'll get:

x = 1.6 $

It'll cost 1.6 $ for total coating

^_^ correct me if I'm wrong

Answer 2

A.) $180.86
B.) $361.73
C.) $60.29
D.) $1,808.60

Answer 3

lol, I got none, so I guess I'm wrong ^^"

Answer 4

That's okay.. I have another for ya if you wanna try

Answer 5

sure ^_^