如图,
中,
是
的角平分线,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22465f31a3d3d0d6e02b196329d0fec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbfc35fc915ac7d4dc017e60ccdecbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34323137ddb894a70d97511aa5fe6f98.png)
![](https://img.xkw.com/dksih/QBM/2021/9/22/2813518968913920/2813775692218368/STEM/4d42323a-dcee-420d-af1f-11f9ddc17391.png?resizew=187)
更新时间:2021-09-22 20:24:12
|
相似题推荐
解答题-证明题
|
适中
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真题
【推荐1】如图,在⊙O中,AB为直径,点C为圆上一点,延长AB到点D,使CD=CA,且
.
![](https://img.xkw.com/dksih/QBM/2020/7/20/2509849994928128/2509892989755393/STEM/7685d7f4-0cac-4383-8181-8fcd3e533355.png?resizew=206)
(1)求证:
是⊙O的切线.
(2)分别过A、B两点作直线CD的垂线,垂足分别为E、F两点,过C点作AB的垂线,垂足为点G.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/691048ce61c91a8a3680fa3025193160.png)
![](https://img.xkw.com/dksih/QBM/2020/7/20/2509849994928128/2509892989755393/STEM/7685d7f4-0cac-4383-8181-8fcd3e533355.png?resizew=206)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)分别过A、B两点作直线CD的垂线,垂足分别为E、F两点,过C点作AB的垂线,垂足为点G.求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1e631fb17406c073ab26e59e12c3b9.png)
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【推荐2】(1)如图1,在△ABC中,已知OB,OC分别平分∠ABC,∠ACB,BP,CP分别平分∠ABC,∠ACB,的外角∠DBC,∠ECB.
![](https://img.xkw.com/dksih/QBM/2021/1/27/2645119090475008/2650794878164992/STEM/f5f28d4100d645d5b0ba4d1de702e078.png?resizew=478)
①若∠A=50º,则∠O=______,∠P=______;
②若∠A=α,则∠O=______,∠P=______.(用含α的式子表示)
(2)如图2,在四边形ABCD中,BP,CP分别平分外角∠EBC,∠FCB,请探究∠P与∠A,∠D的数量关系,并说明理由;
(3)如图3,在六边形ABCDEF中,CP,DP分别平分外角∠GCD,∠HDC,请直接写出∠P与∠A,∠B,∠E,∠F的数量关系______.
![](https://img.xkw.com/dksih/QBM/2021/1/27/2645119090475008/2650794878164992/STEM/f5f28d4100d645d5b0ba4d1de702e078.png?resizew=478)
①若∠A=50º,则∠O=______,∠P=______;
②若∠A=α,则∠O=______,∠P=______.(用含α的式子表示)
(2)如图2,在四边形ABCD中,BP,CP分别平分外角∠EBC,∠FCB,请探究∠P与∠A,∠D的数量关系,并说明理由;
(3)如图3,在六边形ABCDEF中,CP,DP分别平分外角∠GCD,∠HDC,请直接写出∠P与∠A,∠B,∠E,∠F的数量关系______.
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解答题-作图题
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名校
【推荐1】已知:如图,△ABC中,∠BAC=90°,AB=AC,D为AC中点,F为BC上一点,AF⊥BD于E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/a637f149-254a-499e-9357-9944c44b0ba3.png?resizew=188)
(1)使用尺规完成基本作图:作∠BAC的角平分线交BD于G.(保留作图痕迹,不写作法,不下结论)
(2)填空:
求证:AG=CF.
证明:∵∠BAC=90°,AB=AC
∴∠ABC=∠C= °
∵AG平分∠BAC
∴∠BAG=
∠BAC=45°( )(填推理依据)
∴∠BAG=∠C
∵AF⊥BD
∴∠AEB=90°=∠
∴∠1+∠BAE=90°,∠2+∠BAE=90°
∴∠1=∠2
∴△ACF≌
∴AG=CF
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/a637f149-254a-499e-9357-9944c44b0ba3.png?resizew=188)
(1)使用尺规完成基本作图:作∠BAC的角平分线交BD于G.(保留作图痕迹,不写作法,不下结论)
(2)填空:
求证:AG=CF.
证明:∵∠BAC=90°,AB=AC
∴∠ABC=∠C= °
∵AG平分∠BAC
∴∠BAG=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
∴∠BAG=∠C
∵AF⊥BD
∴∠AEB=90°=∠
∴∠1+∠BAE=90°,∠2+∠BAE=90°
∴∠1=∠2
∴△ACF≌
∴AG=CF
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解答题-证明题
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【推荐2】如图,
为
的直径,半径
,
的切线
交
的延长线于点E,
的弦
与
相交于点F.
![](https://img.xkw.com/dksih/QBM/2023/4/22/3222207107842048/3233153916567552/STEM/8d8ffec70c4f46228b05c741a8719df1.png?resizew=286)
(1)求证:
;
(2)若
,且B为
的中点,求
的半径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cee097d4fe948c3d4f1b5c28b24adf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2023/4/22/3222207107842048/3233153916567552/STEM/8d8ffec70c4f46228b05c741a8719df1.png?resizew=286)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa1b5b6051d500fe6c6f1c19c7ee49f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa1b519e1c71e72fc08e9d8fc8271cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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名校
【推荐3】(1)如图,已知在△ABC中,∠BAC=40°,BD⊥AC于D,CE⊥AB于E,BD、CE所在直线交于点F,求∠BFC的度数;
(2)在(1)的基础上,若∠BAC每秒扩大10°,且在变化过程中∠ABC与∠ACB始终保持是锐角,经过t秒(0<t<14),在∠BFC,∠BAC这两个角中,当一个为另一个的两倍时,求t的值;
(3)在(2)的基础上,∠ABD与∠ACE的角平分线交于点G,∠BGC是否为定值,如果是,请直接写出∠BGC的值,如果不是,请写出∠BGC是如何变化的.
(2)在(1)的基础上,若∠BAC每秒扩大10°,且在变化过程中∠ABC与∠ACB始终保持是锐角,经过t秒(0<t<14),在∠BFC,∠BAC这两个角中,当一个为另一个的两倍时,求t的值;
(3)在(2)的基础上,∠ABD与∠ACE的角平分线交于点G,∠BGC是否为定值,如果是,请直接写出∠BGC的值,如果不是,请写出∠BGC是如何变化的.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/c566970a-d4b8-41ab-96a3-a4be105f9007.png?resizew=114)
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解答题-证明题
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名校
【推荐1】如图,
是等边三角形,延长
到
,使
,点
是边
的中点,连接
并延长
交
于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/4/4d4d5e8c-6612-4c69-8609-bf7eb08b104e.png?resizew=173)
(1)求
和
的度数;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7efc841d4bd475c8f9f8ce2d682d783b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/4/4d4d5e8c-6612-4c69-8609-bf7eb08b104e.png?resizew=173)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90026b96116424a245b335b1adb886b.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25bf4852e15c38c5e4570fc64c96a312.png)
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解答题-证明题
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【推荐2】如果一个三角形被一条线段分割成两个等腰三角形,那么这种分割叫做等腰分割,这条线段称为这个三角形的等腰分割线.如图1,当
和
为等腰三角形时,
为
的等腰分割线.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/c14502ce-837f-4cbb-945e-b808e8a17464.png?resizew=339)
(1)如图2,
中,
,线段
的垂直平分线
交
于点D,交
于点E.求证:
是
的一条等腰分割线.
(2)如图3,在
中,
,
,
,请你用两种不同的方法完成
的等腰分割,并在图中标注底角的度数.
(3)在
中,
为
的等腰分割线,且
,
,请直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/c14502ce-837f-4cbb-945e-b808e8a17464.png?resizew=339)
(1)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88dc4d22c2c289f6d4494b9c2be84407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284a563413dc0532138fb2a64db8cc2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b030708f7e622f3f992649b21eec6b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735bd70c2fa2bf51fd7aa448b20d0be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
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解答题-证明题
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适中
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【推荐1】如图,点D、E在线段
上,
,
,点F为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/998dde9c-d9e8-4421-8937-f656d2f88203.png?resizew=126)
(1)求证:
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/998dde9c-d9e8-4421-8937-f656d2f88203.png?resizew=126)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddb1fbb2ecb1dc0ba93546641ce099b1.png)
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解答题-证明题
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适中
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【推荐2】(1)如图1,点
是等腰三角形
的底边
上的一个动点,过点
作
的垂线,交直线
于点
,交
的延长线于点
,请观察
与
,它们有何数量关系?并证明你的猜想.
(2)如果点
沿着底边
所在的直线,按由
向
的方向运动到
的延长线上时,(1)中所得的结论还成立吗?请你在图2中完成图形,写出结论.并证明你的猜想.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6da2235c42867f9a79007c3fc83fec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
(2)如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/2019/12/10/2352139026128896/2352806421463040/STEM/dada91a1-9748-47cf-850a-d84607fc61a4.png)
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