In the figure, ABC is a triangle. D is the mid-point of AB. E and F are points on AC such that DE//BC and DF//BE. If AC = 18cm, find the length of EF.
The figure is shown in the following website:
http://s244.photobucket.com/albums/gg32/chrishonghong/?action=view¤t=6cb0e909.jpg
F.3 Mathz about quadrilateral
2010-05-23 11:13 pm
回答 (1)
2010-05-24 12:25 am
✔ 最佳答案
圖片參考：http://i244.photobucket.com/albums/gg32/chrishonghong/6cb0e909.jpg
EC = AC/2 = 18/2 = 9cm
△BCE ~ △DEF
EC : EF = BC : DE
9 : EF = 2 : 1
EF = 9/2 = 4.5cm
收錄日期: 2021-04-21 22:12:29
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100523000051KK00916