平面内的两条直线有相交和平行两种位置关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/dad65e61-813f-4407-ae7f-57d62ab59979.png?resizew=459)
(1)如图1,若AB
CD,点P在AB、CD内部,∠B=50°,∠D=30°,则∠BPD= .
(2)如图2,将点P移到AB、CD外部,则∠BPD、∠B、∠D之间有何数量关系?请证明你的结论.
(3)如图3,写出∠BPD、∠B、∠D、∠BQD之间的数量关系.(不需证明)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/dad65e61-813f-4407-ae7f-57d62ab59979.png?resizew=459)
(1)如图1,若AB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)如图2,将点P移到AB、CD外部,则∠BPD、∠B、∠D之间有何数量关系?请证明你的结论.
(3)如图3,写出∠BPD、∠B、∠D、∠BQD之间的数量关系.(不需证明)
更新时间:2022-09-22 17:19:58
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解答题-问答题
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【推荐1】【问题背景】
如图,射线
分别交直线
,
于点A,E,
.
【探索求证】
(1)求证:
;
【问题解决】
(2)如图2,G为射线
上一动点,连接
,若
,探究
,
,
之间的数量关系,并说明理由;
(3)如图3,在(2)的条件下,连接
,延长
交射线
于点H,N为线段
上一动点.连接
,若
平分
,
平分
,当
时,求
的值.
如图,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ef31958c93e8e85afe085bd3f7d1eb.png)
【探索求证】
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
【问题解决】
(2)如图2,G为射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f824371a146ba1db2bf20b6f0dacc139.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4a63d14654c66cc71bf26293d698ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac37366d2b54dc7d9a95ac6ddda5f3a8.png)
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名校
【推荐2】如图,EF∥AD,AD∥BC,CE平分∠BCF,∠DAC=120°,∠ACF=20°,求∠FEC的度数.
解:∵AD∥BC,( )
∴∠ACB+∠DAC=180° ,( )
∵∠DAC=120°,(已知)
∴∠ACB=180°﹣∠DAC= °.
∵∠ACF=20°(已知),
∴∠BCF=∠ACB﹣∠ACF
= °.
∵CE平分∠BCF,
∴∠BCE=
∠BCF= °.
∵EF∥AD,AD∥BC,
∴EF∥ ,( )
∴∠FEC=∠BCE= °.( )
解:∵AD∥BC,( )
∴∠ACB+∠DAC=180° ,( )
∵∠DAC=120°,(已知)
∴∠ACB=180°﹣∠DAC= °.
∵∠ACF=20°(已知),
∴∠BCF=∠ACB﹣∠ACF
![](https://img.xkw.com/dksih/QBM/2018/6/23/1973530162823168/1976840741412864/STEM/48d4540f8d314343b36664cfa2f6d46e.png?resizew=5)
∵CE平分∠BCF,
∴∠BCE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
∵EF∥AD,AD∥BC,
∴EF∥ ,( )
∴∠FEC=∠BCE= °.( )
![](https://img.xkw.com/dksih/QBM/2018/6/23/1973530162823168/1976840741412864/STEM/b24a815f860d4b9b9c010d83b57ed173.png?resizew=124)
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解答题-证明题
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【推荐1】如图①,已知直线l1、l2,直线l3和直线l1、l2交于点C和D,在直线l3上有动点P(点P与点C、D不重合),点A在直线l1上,点B在直线l2上.
(1)如果点P在C、D之间运动时,且满足∠1+∠3=∠2,请写出l1与l2之间的位置关系 ;
(2)如图②如果l1∥l2,点P在直线l1的上方运动时,试猜想∠1+∠2与∠3之间关系并给予证明;
(3)如果l1∥l2,点P在直线l2的下方运动时,请直接写出∠PAC、∠PBD、∠APB之间的关系.
(1)如果点P在C、D之间运动时,且满足∠1+∠3=∠2,请写出l1与l2之间的位置关系 ;
(2)如图②如果l1∥l2,点P在直线l1的上方运动时,试猜想∠1+∠2与∠3之间关系并给予证明;
(3)如果l1∥l2,点P在直线l2的下方运动时,请直接写出∠PAC、∠PBD、∠APB之间的关系.
![](https://img.xkw.com/dksih/QBM/2019/7/4/2239172040122368/2239749041348608/STEM/987195270b244c13ac6de0c2462d0de0.png?resizew=299)
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解答题-证明题
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【推荐2】如图,在
和
中,点
在边
上,边
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于点
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