請詳細解釋下條計法. THX
圖片參考：http://imgcld.yimg.com/8/n/HA05788109/o/20131127124156.jpg
急 ! 數 Plane Geometry 問題1條 ?
2013-11-27 8:42 pm
回答 (2)
2013-11-28 8:31 pm
✔ 最佳答案
As triangle ABE is an isosceles right-angled triangle,with angle A = angle B = 45 degrees,
so, BE / AB = cos 45 = 1 / √2,
therefore,
AB / BE = 1 / cos 45 = √2
Also, triangle ABD is an isosceles right-angled triangle,
with angle B = angle D = 45 degrees,
so, AB / DB = cos 45 = 1 / √2 = √2 / 2
2013-11-27 11:28 pm
因為 角AEB=角BEC=角CED=角DEA=90
收錄日期: 2021-04-13 19:49:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20131127000051KK00065