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
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1. English is spoken all over the world.
2. Children under sixteen are not admitted by us.
3.Let the bill be paid today.
4. A novel was read by me yesterday.
5. The box is cleared three times a day by postman.
6. I am greatly astonished by your behavior.
7. Let it be told to them to leave the room at once.
8. Great things are done by great men.
9. A letter is being written by her.
