SOLUTION: An aluminum plate is made according to the following dimensions. The outer radius is 10 inches and the inner radius is 3 inches. (See diagram below) Use p = 3.14 as an approximate

Algebra ->  Average -> SOLUTION: An aluminum plate is made according to the following dimensions. The outer radius is 10 inches and the inner radius is 3 inches. (See diagram below) Use p = 3.14 as an approximate       Log On


   

Question 170768: An aluminum plate is made according to the following dimensions. The outer radius is 10 inches and the inner radius is 3 inches. (See diagram below) Use p = 3.14 as an approximate value. (a) How many square inches in area is the aluminum plate (the shaded region)? (b) If the cost to construct the plate is $7.50 per square inch, what is the construction cost?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
well I cant see the shaded area but I think I know what they are after .
:
Area of the total is A=%28pi%2910%5E2 Area of the interior portion is A=%28pi%293%5E2 we have 100%28pi%29-9%28pi%29= 91%28pi%29=highlight%28A=285.74%29sq in
:
285.74%287.5%29=highlight%282143.05%29dollars