如图,已知⊙O的直径AB与弦AC的夹角为35°,过C点的切线PC与AB的延长线交于点P,那么∠P等于( )
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758848850362368/1816566449266688/STEM/304ffc3c6e624c8fa4f26438214df6eb.png?resizew=107)
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758848850362368/1816566449266688/STEM/304ffc3c6e624c8fa4f26438214df6eb.png?resizew=107)
A.15° | B.20° |
C.25° | D.30° |
更新时间:2017-11-24 17:08:43
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【知识点】 几何证明选讲
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【推荐1】如图,在
中,AD⊥BC于D,下列条件:
①∠B+∠DAC=90°,
②∠B=∠DAC,
③
,
④AB2=BD·BC.
其中一定能够判定
是直角三角形的共有( )
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①∠B+∠DAC=90°,
②∠B=∠DAC,
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f5b4aabdd00e840d1f472d19e980848.png)
④AB2=BD·BC.
其中一定能够判定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】如图:正方体ABCD—A1B1C1D1中,E、F、G、H、K、L分别为AB、BB1、B1C1、C1D1、D1D、DA的中点,则六边形EFGHKL在正方体面上的射影可能是( )
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