Discussion of Question with ID = 093 under Areas

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Question

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?

A

240π sq. cm.

B

480π sq. m.

C

57600π sq. m.

D

120π sq. m.

Soln.
Ans: a

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

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