[問題]GWD-13-17

[marco]

各位大大,很不好意思,圖貼不上來~~
Q17:

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
我覺得是A啦,可是答案卻是D~~想不出來為什麼~~教教我吧!!

[marco]

對不起阿..版主大大,我第一次貼圖,不好意思,造成你的困擾了...不知道這樣貼對不對..如果還有錯的話,真的很對不起,再麻煩你移掉~~sorryㄋㄟ

[huacy]

sorry 希望你能體諒 因為同樣的圖檔 你這張的 jpg 大概是 bmp 的 1/50
所以才希望貼圖使用 jpg or gif or png 節省流量 這樣別人看你的圖才會快

[魚]

我也得 A

[homaru]

here~
http://www.formosamba.com/phpBB3/viewtopic.php?t=1034

[魚]

(L) 多謝荷馬魯

[marco]

homaru很感謝ㄋㄟ~~每次問題都是由你幫忙,真的很感謝~~

[hsiang610]

答案是D嚕~

(1)大家應該都會算~所以不解囉~

(2)CE=CD+DE=1+4=5
C為大圓半徑,所以CE=AC=5
AD=AC+CD=5+1=6
B為小圓半徑,所以AB=1/2AD=3
故求得大小二圓之半徑,陰影部份即可得知.

8-| 大家加油!我剩下不到三天~