TAOTAO 版GWD-10-Q2:做了好多次都没搞明白

ddcder

TAOTAO 版GWD-10-Q2:

 

D   D

·      · .  B      C                 C

 

 

 

 

                                                    

                 A                                            EE

 

 

 

 

 

 

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      answer: a

(2)
                  CD =1 and DE = 4

我选D，（2）通过列方程也能分别求出大圆和小圆的半径
            。恳请大家指点迷津，谢谢              

yaoyao99

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=184062&page=1

涛涛第10套——GIGI第11套，对应关系：题号按顺序对应。

11-2 http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=74324

11-2 http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=55663
    

supershuang

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