还是那道小圆内切大圆的题，我怎么还是选A啊，看了以前的讨论没有看懂。

Q2:

D

· · B C

INE>INE> A E

In the figure, points A, B, C, D, and E lie on a line. A is on both circles, B is the center of the smaller circle, C is the center of the larger circle, D is on the smaller circle, and E is on the larger circle. What is the area of the region inside the larger circle and outside the smaller circle?

(1) AB = 3 and BC =2

(2) CD =1 and DE = 4

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

以前讨论说

from2: R=CD+DE=5, r=(R*2-DE)/2=3

这个等式代表什么啊？谢谢！

CD+DE=AC=5(大圆半径R)

INE>INE>AC+CD=2r(小圆半径)=5+1=6

r=3 R=5 可以得所求