CE Maths 2009

👨🏻‍🏫 學術台數學

2009-04-29 6:57 am

As follows:

圖片參考：http://i707.photobucket.com/albums/ww74/stevieg90/01-10.gif

更新1:

我想要proof.

回答 (2)

2009-04-29 7:50 am

✔ 最佳答案

Triangle BEA ~ Triangle CED {angle in same segment + alt angle}

So, CD/AB = DE/AE

also ADE is right angle , so cosT = DE/AE

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2009-04-29 8:41 am

prove什麼!?

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