Question

A semicircular window with a RADIUS OF 20 inches is going to be laminated with a sunblock coating that costs 1.50 PER SQUARE INCH. How much will it cost to coat this window?

A: 200$
B: 942$
C: 1,593$
D: 1,884$

Answer 1

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.

Answer 2

B:942$

Explanation:

(pi*20^2)/2 is approximately 628.32

628.32*1.5=942.48