prep125 谢谢你们的帮忙

hebelong · 发表于 2011-6-7 20:16:26

125.12681-!-item-!-187;#058&008922

The figure shown represents a piece of land that is in the shape of a quarter circle.If the land is enclosed by a fence, which of the following is closest to the length, in feet, of the fence?

(A) 278

(B) 341

(C) 357

(D) 400

(E) 441

吖吖啊，图弄不上来？！？！？描述一下（一个扇形，角90度，半径是100ft）答案是C我错选E了

hebelong · 发表于 2011-6-9 09:18:10

自己顶一下~

若渺2008 · 发表于 2011-6-9 12:42:58

200+3.14*2*100/4=357

flywer · 发表于 2011-6-9 15:57:00

恩~ls的思路很好啊
就把这个题想象成是求一个圆周长的四分之一外加圆的半径*2就好

tb600ml · 发表于 2011-6-9 16:21:43

我来晚了……

prep125 谢谢你们的帮忙

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