Discussion of Question with ID = 093 under Areas

This is the discussion forum for this question. If you find any mistakes in the solution, or if you have a better solution, then this is the right place to discuss. A healthy discussion helps all of us, so you are requested to be polite and soft, even if you disagree with the views of others. The question and its current solution has also been given on this page.



Two concentric circles of radii 19 and 11 cm are drawn on a paper. What is the area of the portion that is inside the outer circle but outside the inner circle?


240π sq. cm.


480π sq. m.


57600π sq. m.


120π sq. m.

Ans: a

The required area is difference of the areas of the two circles. π($19^2 - 11^2$) = 240π sq. cm.

Comments and Discussion