天山DS一题求解答

houhaibo528 · 发表于 2011-9-24 09:00:21

In the figure, point A,B,C,D and E lie on a line, A is on both circles, B is the center of the smaller cirlce, 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.1 sufficient
B. 2 sufficient
C. 1,2 together
D. 1,2 each
E. neither
我觉得1,2都没问题了，选了D，答案是A
图附件里了

houhaibo528 · 发表于 2011-9-24 09:21:38

求解，自顶

bobchowz · 发表于 2011-9-24 09:34:35

这个你是对的

天山DS一题求解答

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