soulangel1 said:
a circular window with a radius of 12 inches is to be laminated with a sunblock coating that costs $0.65 per square inch to apply. what is the total cost of coating for the window to the nearest cent? use ? = 3.14 area of circle is a=?r^2
You are given the formula for the area of a circle:
A = n*r[sup:zad3fnpq]2[/sup:zad3fnpq]
r is the radius, and you're told that the radius is 12 inches. Substitute 12 for "r"
n (which in every version of the formula for the area of a circle
I have ever seen is the mathematical constant
pi) is 3.14 ....that's pi, rounded to two decimal places. Substitute 3.14 for "n".
Do the arithmetic, and you will find the area of the circle in square inches.
You are told that the coating costs $0.65 per square inch.
Multiply the number of square inches you'll need (which you've found above) by $0.65 to find the total cost for covering the window.
If you're still having trouble with this problem, showing us all of the work you've done. Tell us WHERE and WHY you are stuck.
