如图,四边形
内接于
,
是直径,
,连接
,过点D的直线与
的延长线相交于点E,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/7/2fb6128b-dc55-4726-b289-4654b534a6f8.png?resizew=134)
(1)求证:直线
是
的切线;
(2)求证:
平分
;
(3)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f0be5319d568ba842d954fe63e02cd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/7/2fb6128b-dc55-4726-b289-4654b534a6f8.png?resizew=134)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
更新时间:2024-02-07 18:27:11
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知
是等边三角形,D、E分别在边
、
上,且
,连接
并延长至点F时,
,连接
、
和
.
是怎样的四边形,并说明理由;
(2)若
,
,求四边形
的面积.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b70c662d45c1b741ea5ed7a31007cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c92d220be10b55272aab5bacd9f69721.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b6bef27de230acad352f25e954f4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】景德桥,俗称西关大桥,是我国一座著名的古代石拱桥.景德桥位于山西省东南部的晋城西门外,横跨沁水河,过去,它是晋城通往沁水河阳城地区交通干道上的一座重要桥梁,故曾又名沁阳桥.桥下水面宽度
是20米,拱高
是4米,若水面上升3米至
处.
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694681831809024/2700916457562112/STEM/56b44c89-b1d6-4a2f-8dc5-c45f751b0711.png)
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694681831809024/2700916457562112/STEM/d93c7e77-1438-4dbe-a5ca-52bd19f71dbb.png)
(1)把拱桥看作抛物线的一部分,建立如图1所示的平面直角坐标系,求水面宽度
.
(2)把拱桥看作圆的一部分,则可构造如图2所示的图形,求水面宽度
.
![](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/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694681831809024/2700916457562112/STEM/56b44c89-b1d6-4a2f-8dc5-c45f751b0711.png)
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694681831809024/2700916457562112/STEM/d93c7e77-1438-4dbe-a5ca-52bd19f71dbb.png)
(1)把拱桥看作抛物线的一部分,建立如图1所示的平面直角坐标系,求水面宽度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)把拱桥看作圆的一部分,则可构造如图2所示的图形,求水面宽度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,在
中,
,点
为边
上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/7d484907-285c-466d-aea6-551287acc03e.png?resizew=163)
(1)尺规作图:在边
上找一点
,使得
;
(2)在(1)的条件下以点
为圆心,
为半径的圆分别与
交于
点,且
.求证:
与
相切.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/7d484907-285c-466d-aea6-551287acc03e.png?resizew=163)
(1)尺规作图:在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41636721923c2ddd9c6bbb0b42402829.png)
(2)在(1)的条件下以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8dcac32b16b34f4dc005794e79e49cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c72c070f4f4d2b44927391b59a1e755.png)
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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,⊙O中,AB、CD是⊙O的直径,F是⊙O上一点,连接BC、BF,若点B是弧CF的中点.
![](https://img.xkw.com/dksih/QBM/2015/7/6/1578684055756800/1578684056174592/STEM/a72f7b82beb6404296fe9e60ee096d5f.png)
(1)求证:△ABF≌△DCB;
(2)若CD⊥AF,垂足为E,AB=10,∠C=60°,求EF的长.
![](https://img.xkw.com/dksih/QBM/2015/7/6/1578684055756800/1578684056174592/STEM/a72f7b82beb6404296fe9e60ee096d5f.png)
(1)求证:△ABF≌△DCB;
(2)若CD⊥AF,垂足为E,AB=10,∠C=60°,求EF的长.
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在Rt
ABC中,∠ABC=90°,P是斜边AC上一个动点,以BP为直径作⊙O交BC于点D,与AC的另一个交点E,连接DE、DP.点F为线段CP上一点,连接DF,∠FDP=∠DEP.
![](https://img.xkw.com/dksih/QBM/2022/1/16/2895454536409088/2896435023749120/STEM/d74f1969-9875-4575-aa69-34b54b5aa359.png?resizew=312)
(1)求证:DF是⊙O的切线;
(2)当
时,求证AB=AP;
(3)当AB=15,BC=20时,是否存在点P,使得
BDE是以BD为腰的等腰三角形,若存在,求出所有符合条件的CP的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2022/1/16/2895454536409088/2896435023749120/STEM/d74f1969-9875-4575-aa69-34b54b5aa359.png?resizew=312)
(1)求证:DF是⊙O的切线;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/464b10012c412536f9b4a1e048bbd2e6.png)
(3)当AB=15,BC=20时,是否存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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名校
【推荐2】如图,
为
的直径,点C平分弧
,点D为弧
上一点,
与
相交于点F,过C作射线
与射线
相交于点E,且
.
与
相切;
(2)若
,
,求
的长.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/31b53a892fdbed25d40921075bb66c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2842a24455b7118c8f769eb31f3a03cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次
解答题-证明题
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适中
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【推荐1】如图,
是
的外接圆,
是
的直径,过点
作直线
,交
的延长线于点
,且满足
,过点
作
于点
,
与
交于点
.
(1)求证:
.
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64eb70f93f54ea4e80395e0f0415d8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf6c62979a7aa534a191d8387a741e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/7884da69-76e3-4b35-8742-b0592caaed48.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cfe6bd66b7808db080882d4c1c760d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe76041387f180080ea87a63420db118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,四边形ABCD内接于⊙O,E为BC延长线上的一点,点C为
的中点.若∠DCE=110°,求∠BAC的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901404095913984/2901507258974208/STEM/707aa522-f891-470b-a887-ad36e3775b8f.png?resizew=158)
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