锐角三角比的题目
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锐角三角比的题目
![](http://img.wesiedu.com/upload/0/e9/0e9354bda5eb7fedd276c175c21981ae.jpg)
![](http://img.wesiedu.com/upload/0/e9/0e9354bda5eb7fedd276c175c21981ae.jpg)
![锐角三角比的题目](/uploads/image/z/18469522-10-2.jpg?t=%E9%94%90%E8%A7%92%E4%B8%89%E8%A7%92%E6%AF%94%E7%9A%84%E9%A2%98%E7%9B%AE)
BD/AD=tana
CD/AD=tanb
BD/CD=tana/tanb BD=CD*tana/tanb
BD+CD=BC
(1+tana/tanb)CD=BC
CD=BC/(1+tana/tanb) =BCtanb/(tana+tanb)
CD/AD=tanb
BD/CD=tana/tanb BD=CD*tana/tanb
BD+CD=BC
(1+tana/tanb)CD=BC
CD=BC/(1+tana/tanb) =BCtanb/(tana+tanb)