-
The area of the circle with radius y is w. The difference between the areas of the bigger circle (with radius y) and that of the smaller circle (with radius x) is w’. So x/y is equal to
-
-
√1 - w' w -
√1 + w' w -
√1 + w w' -
√1 + w w'
-
Correct Option: A
w = πy² = Area of larger circle
w' = πy² – πx²
⇒ w' = w – πx²
⇒ πx² =
| ∴ | = | ||
| πy² | w |
| ⇒ | = 1 - | ||
| y² | w |
| ⇒ | = √1 - | ||
| y² | w |
