標題:

maths trigonometry

發問:

圖片參考:http://imgcld.yimg.com/8/n/HA00274964/o/20131106233309.jpg could you please explain this question with steps? thanks!

最佳解答:

(=^o^=) Yuki, nice question!!! (1) Note that AB // DC. (2) Then, you can know that △ABE ~ △DCE (AAA) (3) By similar triangle, you know that BE : DE = AB : DC (this is what you are asked) (4) Note that tan φ = AB/BC tan θ = DC / BC (5) Therefore, BE : DE = AB : DC = AB/BC : DC/BC = tan φ : tan θ

其他解答:

免費註冊體驗

 

此文章來自奇摩知識+如有不便請留言告知

文章標籤
創作者介紹
創作者 ute40zf07t 的頭像
ute40zf07t

ute40zf07t的部落格

ute40zf07t 發表在 痞客邦 留言(0) 人氣()