题型:解答题-证明题
难度:0.65
引用次数:168
题号:19321624
如图,在
中,
交
于点
,点
是
的中点,
交
的延长线于点
,交
于点
,
.求证:
为
的角平分线.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d354155f71a1736c1c9186168695edd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9a8bd8c09d9a6b6c4331399226678ff.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/2023/6/18/3262244941529088/3262396811706368/STEM/298a06d1e46c44819928ced167f6edbb.png?resizew=194)
更新时间:2023-06-18 16:26:12
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解答题-证明题
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适中
(0.65)
【推荐1】如图,四边形
中,
,E是
的中点,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/79ed69e0-5941-4c0e-a8bf-a98dc2986c89.png?resizew=150)
(1)求证:
、
分别平分
:
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/315b8ca22ef1cf464994a4b4ec46ee0b.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a48e31deb78dadacc7e128ef3eb2a054.png)
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解答题-证明题
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适中
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名校
【推荐2】如图,直线AM是⊙O的切线,切点为A,点B在⊙O上,BD⊥AM, 垂足为D,BD与⊙O交于点C,∠B=60°.
(1)求证:OC平分∠AOB;
(2)若⊙O 的半径为4,求图中阴影部分的面积(结果保留和根号).
(1)求证:OC平分∠AOB;
(2)若⊙O 的半径为4,求图中阴影部分的面积(结果保留和根号).
![](https://img.xkw.com/dksih/QBM/2020/12/19/2617662715666432/2618914222342144/STEM/fbc80078dfe14ed4a36754ed02482e03.png?resizew=145)
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解答题-证明题
|
适中
(0.65)
【推荐1】综合与实践
(1)如图1,
为等边三角形,先将三角板中的
角与
重合,再将三角板绕点C按顺时针方向旋转(旋转角大于
且小于
),旋转后三角板的一直角边与
交于点D,在三角板斜边上取一点F,使
,线段
上取点E,使
,连接
.
①证明:
.
②证明:
.
(2)如图2,
为等腰直角三角形,
,先将三角板中的
角与
重合,再将三角板绕点C按顺时针方向旋转(旋转角大于
且小于
),在三角板另一直角边上取一点H,使
,在线段AB上取点G,使
,连接
,请直接写出线段
之间的数量关系.
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aebb5baea4ac1668b674a8634e15bcbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdebc1592efdbdf58b9b0dd9ee725c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2cbf4832edc6cd70d551eb52c8b3c71.png)
①证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc9b814299512cce2f3a1ed9c533c08.png)
②证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe6d389a6c448d92b79d89bc9e8489f.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ab252285c721f65587eec88e3f2fbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf84ba8e3ce4dab1c9efa1e0e59f0495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5a8e3f95964ab78e9c9e8da29ddfcf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3717c6384095ac3dbd67fe67983cabfb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/74f72029-adf4-46af-8f20-6857a8914ae2.png?resizew=503)
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解答题-证明题
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适中
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【推荐2】如图
内接于
,且
.
的外角平分线交
于
垂足为
.
(1)求证:
;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd260fb9d772c122dcb1df52cbe38ab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e82214ee32b6b849a9b7beee0b6f41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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解答题-作图题
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适中
(0.65)
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【推荐1】图①、图②、图③均是
的正方形网格,每个小正方形的边长均为1,每个小正方形的顶点称为格点,
的顶点均在格点上.只用无刻度的直尺,在给定的网格中,分别按下列要求画图,保留适当的作图痕迹.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/63010cd6-a599-4369-b2de-431e03ea0add.png?resizew=472)
(1)在图①中找点D,连接DA、DB、DC,使得
.
(2)在图②中找点E,连接AE、BE,使得
.
(3)在图③中找点F,连接AF、BF,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd4be97adde17423d59d86d18318c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/63010cd6-a599-4369-b2de-431e03ea0add.png?resizew=472)
(1)在图①中找点D,连接DA、DB、DC,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0f630195bcf6c3ca8f4fdeff43b082.png)
(2)在图②中找点E,连接AE、BE,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e56c222c15e924079ccc0f4213ddb3f.png)
(3)在图③中找点F,连接AF、BF,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa6f7a440e027b540e0edd8f02410e0.png)
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解答题-作图题
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适中
(0.65)
【推荐2】如图,在等腰三角形ABC中,AB=AC,AD⊥BC于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/babd2d40-6723-4f43-8dff-d234504fe41a.png?resizew=210)
(1)尺规作图:在∠ADB的内部作射线DE,使∠ADE=∠CAD;(不要求写作法,保留作图痕迹);
(2)若(1)中的射线DE交AB于点F,且BC=6,AD=4,求△ADF的周长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/babd2d40-6723-4f43-8dff-d234504fe41a.png?resizew=210)
(1)尺规作图:在∠ADB的内部作射线DE,使∠ADE=∠CAD;(不要求写作法,保留作图痕迹);
(2)若(1)中的射线DE交AB于点F,且BC=6,AD=4,求△ADF的周长.
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解答题-问答题
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适中
(0.65)
名校
【推荐1】如图1,点E在AD的延长线,BE、CD交于点F,AD∥BC,∠A=∠C
(1)说明CD与AB的位置关系
(2)如图2,若∠EDF、∠CBE的角平分线交于G,∠ABE=50°,求∠G
(1)说明CD与AB的位置关系
(2)如图2,若∠EDF、∠CBE的角平分线交于G,∠ABE=50°,求∠G
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解答题-作图题
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适中
(0.65)
【推荐2】已知,如图,在
中,
是
的平分线,且
,过点C作
的垂线,交
的延长线于点H.以直线
为对称轴作点A的对称点P,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/22f8d427-7553-4f62-89c1-6642577deef7.png?resizew=161)
(1)依题意补全图形;
(2)直接写出
与
的位置关系;
(3)用等式表示线段
与
之间的数量关系,并证明.
![](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/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/22f8d427-7553-4f62-89c1-6642577deef7.png?resizew=161)
(1)依题意补全图形;
(2)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
(3)用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6d831223c3c4ae2ee718118f97a06d6.png)
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