问题解决:(1)如图1,在四边形
中,A为
上一点,且
,若
,则求证:
.
拓展探究:(2)如图2,A、B为线段
的垂直平分线上两点,且
,过点B作
于E点,
的垂直平分线交
于F点,连
、
.试求
的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/1b9ab2a5-3e44-40ff-85e0-8130cc9091ac.png?resizew=311)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0236057a550cb5ff02dedd15e1c48f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
拓展探究:(2)如图2,A、B为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90026b96116424a245b335b1adb886b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/1b9ab2a5-3e44-40ff-85e0-8130cc9091ac.png?resizew=311)
图1 图2
更新时间:2024-03-27 14:43:26
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解答题-证明题
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解题方法
【推荐1】已知:CD是经过∠BCA的顶点C的一条直线,CA=CB,E、F是直线CD上两点,∠BEC=∠CFA=∠α.
(1)若直线CD经过∠BCA的内部,∠BCD>∠ACD.
①如图1,∠BCA=90°,∠α=90°,写出BE,EF,AF间的等量关系: .
②如图2,∠α与∠BCA具有怎样的数量关系,能使①中的结论仍然成立?写出∠α与∠BCA的数量关系 .
(2)如图3.若直线CD经过∠BCA的外部,∠α=∠BCA,①中的结论是否成立?若成立,进行证明;若不成立,写出新结论并进行证明.
(1)若直线CD经过∠BCA的内部,∠BCD>∠ACD.
①如图1,∠BCA=90°,∠α=90°,写出BE,EF,AF间的等量关系: .
②如图2,∠α与∠BCA具有怎样的数量关系,能使①中的结论仍然成立?写出∠α与∠BCA的数量关系 .
(2)如图3.若直线CD经过∠BCA的外部,∠α=∠BCA,①中的结论是否成立?若成立,进行证明;若不成立,写出新结论并进行证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/d02a0794-5f7e-4e7b-85c7-dc7ad89ab204.png?resizew=606)
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【推荐2】如图,四边形
中,CA平分
,
,
于
.
(1)求证:
;
(2)若
,
,求AB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a651eb577dbada1f29590e558d6f9fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4579332087ee585f1cae423a6ae1862.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21d8e7af78693e5da7957c8034e8bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ade06068471a9d76e32b417bef7551.png)
![](https://img.xkw.com/dksih/QBM/2021/11/3/2843166526717952/2845481373483008/STEM/6dfd7107-b143-4c72-9bd8-fe98696b9b74.png)
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解答题-作图题
|
适中
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【推荐1】在学习了垂径定理后,同学们开始探索用直尺和圆规来平分一条已知弧的方法,老师请小亮同学做如下四等分圆弧问题的操作:
请利用直尺和圆规四等分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
小亮的作法如下:
①连接
;
②作
的垂直平分线
交
于点
,交
于点
;
③分别作线段
,线段
的垂直平分线
,
,交
于
,
两点.
那么
,
,
三点把
四等分.
(1)小明否定了小亮四等分
作法的正确性,请你帮小明简要说明判断小亮作法错误的理由;
(2)请你利用直尺和圆规四等分所给的
(仿照小亮,写出简要的作法步骤,保留作图痕迹).
请利用直尺和圆规四等分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/10/89ec1bd5-7df5-4ca1-b41e-5c706bcea91a.jpg?resizew=113)
小亮的作法如下:
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②作
![](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/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
③分别作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b1ec05e3cec27677ded7b4aecaa62d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7bf58e5fea1189b33cf55d86335452f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
那么
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/10/813887eb-a0d4-4db8-a851-3f672b47062d.jpg?resizew=113)
(1)小明否定了小亮四等分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
(2)请你利用直尺和圆规四等分所给的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/10/355d9382-3c83-4c34-92c3-2be8ebcb2d10.jpg?resizew=116)
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【推荐2】如图, AB、BC的垂直平分线交于点P,
(1)求证:PA= PC;
(2)连接AC,
①若∠ABC=150°,证明△PAC是等边三角形.
②若∠ABC= °,△PAC是等腰直角三角形.(直接填结果,不需要说明)
(1)求证:PA= PC;
(2)连接AC,
①若∠ABC=150°,证明△PAC是等边三角形.
②若∠ABC= °,△PAC是等腰直角三角形.(直接填结果,不需要说明)
![](https://img.xkw.com/dksih/QBM/2017/12/1/1829273545818112/1831358689886209/STEM/20febc8e00ad4909b858be90d1017d64.png?resizew=136)
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【推荐1】如图,已知点A、C分别在
的边
、
上,且
,
//
,与
的平分线
交于点D,连接
.求证:
平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a14654f44613e7dc85413f173e5cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/21bba874-fbd8-4e8c-96b2-8bd3b692bb98.png?resizew=198)
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【推荐2】如图,
中,
于D,
,
,动点P从点B出发以每秒1cm的速度沿线段BA向点A运动,同时动点Q从点D出发以每秒2cm的速度沿D→C→A方向运动,当其中一点到达终点时整个运动都停止,设点P运动的时间为t(秒).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/c3ca96f3-c907-4745-a163-e7139b21a36b.png?resizew=181)
(1)求证:
是等腰三角形;
(2)当点Q在边CA上运动时,若
的边与BC平行,求t的值;
(3)
能否成为等腰三角形?若能,求出t的值;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c298547e76fe67aa1d70fa48afa02b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0345ae0a8137e431ba7c9602cfce65ae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/c3ca96f3-c907-4745-a163-e7139b21a36b.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)当点Q在边CA上运动时,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f1d6567bef09b00b7f37894e6dba7.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217d37ca5469a57cb7417a2ac0d58efe.png)
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