What book is this from than I can help
The area of central circle would be : pi. d^2 /4
the area of the next region would be : pi ( d^2 - d^2/4) = 3/4 pi d^2
The outermost region would be : pi (9d^2 / 4 - d^2/4) = 5/4 pi d^2
Just multiply all equation with 4, you will get that the ratio will become 1 : 3 : 5
Hope this helps
Answer:
A conclusion that is in favour:
"Using public money to maintain national landmarks is a good policy in the sense that a national landmark is a public good: no one can be excluded from enjoying the view of a national landmark like the Arch in St. Louis for example.
Because they are public goods, national landmarks are not likely to be profitable or provided by the private sector in a free market, and for this reason, government intervention in the form of public money becomes necessary".