如图,
是
的直径,直线
与
相切于点
,
,垂足为
.求证:
平分
.
![](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/0f85fca60a11e1af2bf50138d0e3fe62.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/e13b505788d3d02bf232ac637fc3a8ee.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/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/81eade8a-56ea-4d17-bb17-d5077ff7b57b.png?resizew=160)
更新时间:2023-12-30 21:26:48
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相似题推荐
解答题-证明题
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【推荐1】已知:如图,点B,E,F,C在同一条直线上
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/19216461-19e2-4110-b541-d83702ec4d56.png?resizew=139)
(1)求证:
;
(2)求证:四边形AEDF是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c55ee522f41c43253050e92b3c8de31.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/19216461-19e2-4110-b541-d83702ec4d56.png?resizew=139)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57cfa2fe76009b2ea36df44b1f8bb4d9.png)
(2)求证:四边形AEDF是平行四边形.
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【推荐2】【阅读思考】如图①,已知
,探究
、
、
之间关系,小明添加了一条辅助线.解决了这道题.得到的结果是
.
证明过程如下:
如图①,过点
作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9f641563e8533a5bb39188aa7cc182.png)
.
,
,
,
,即
.
,求
的度数;
(2)【拓展探索】如图③,已知
,点
在点
的右侧,
,
平分
,
平分
,
,
所在的直线交于点
,点
在直线
与
之间,点
在点
的右侧,且
,
,若
,则
度数为 ?(用含
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03733d1465d041a6d6da32bf91a7cff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1f954d2d6ce1c935fa6c9a7f9de6ad3.png)
证明过程如下:
如图①,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9f641563e8533a5bb39188aa7cc182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a772b41de6cab4c2acca5bf9b865833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32bf0ea5fbeec01b96f25a329f63d6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5a897346cb5e3c10268c41f112997f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24592bfd5ab683f124ce1b3849659812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f961b1b5391ed6c272f7a22fda3fd1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1f954d2d6ce1c935fa6c9a7f9de6ad3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03733d1465d041a6d6da32bf91a7cff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded11f1d465cee30733c43bbd332bbfd.png)
(2)【拓展探索】如图③,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0b17b275d892a076f768524c400a6f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ce3618abaf1907e7661e4204047f4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4652f95f3a388706906bc85f53f8db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074d1bdb0a6c414fa3d8b8b316e2e9b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解答题-证明题
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【推荐3】请将证明过程填写完整(填写理由或数学式)
(1)已知:如图,
,
,求证:
.
证明:∵
∴______
(______)
∴
(______)
又∵
∴
______ (等量代换)
∴
(______)
∴
(______)
![](https://img.xkw.com/dksih/QBM/2022/5/4/2977086073085952/2987058618179584/STEM/24f6d551-e03a-4867-b37c-acdda17a3a88.png?resizew=192)
(2)如图,
,
,若,求
.
解:∵EF∥AD,(已知)
∴∠2=______,(___________ )
又∵∠1=∠2,(已知)
∴∠1=∠3,(等量代换)
∴AB∥______,(___________ )
∴∠AGD+∠BAC=180°(___________ )
∵∠BAC=70°,(已知)
∴∠AGD=______.
(1)已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508e437c2eb609c6256c78b94abaab7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7194a580d947197182e893cbda5d8caf.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508e437c2eb609c6256c78b94abaab7e.png)
∴______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f68f4424008113481d68afd2ca5172e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b31c00ebdf18f34e3d07d450d5be9e.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0549bb91e14886e278228b16096528.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd81adb13f5a7550b0f94f770900a613.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7194a580d947197182e893cbda5d8caf.png)
![](https://img.xkw.com/dksih/QBM/2022/5/4/2977086073085952/2987058618179584/STEM/24f6d551-e03a-4867-b37c-acdda17a3a88.png?resizew=192)
(2)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d354155f71a1736c1c9186168695edd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d74465c34ad7afa5d39d9e300bdf86.png)
解:∵EF∥AD,(已知)
∴∠2=______,(___________ )
又∵∠1=∠2,(已知)
∴∠1=∠3,(等量代换)
∴AB∥______,(___________ )
∴∠AGD+∠BAC=180°(___________ )
∵∠BAC=70°,(已知)
∴∠AGD=______.
![](https://img.xkw.com/dksih/QBM/2022/5/4/2977086073085952/2987058618179584/STEM/5f929662-2bbe-4a34-a3a6-5eb7b9f5e2ec.png?resizew=201)
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【推荐1】如图,已知D为
上一点,点C在直径
的延长线上,
与
相切,交
的延长线于点E,且
.
![](https://img.xkw.com/dksih/QBM/2022/10/25/3095562068369408/3103677849960448/STEM/1406045a1e78424680ddd53ccff8e2a6.png?resizew=251)
(1)判断
与
的位置关系,并说明理由;
(2)若
,求BE的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.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/ba11242dcc61d3c7c3555b598b5fdc89.png)
![](https://img.xkw.com/dksih/QBM/2022/10/25/3095562068369408/3103677849960448/STEM/1406045a1e78424680ddd53ccff8e2a6.png?resizew=251)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef1ce41b1bc8bacec48a257e95ae36c.png)
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【推荐2】如图,已知
是
的角平分线,E是
延长线上的一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/7c866d0e-bae5-415e-b463-af363bb45e27.png?resizew=160)
(1)求证:
.
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/7c866d0e-bae5-415e-b463-af363bb45e27.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe3286bd84a88f5043fda0d40dc7e52.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ad2dc513de905ed6bc7cb0bd44994d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-作图题
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【推荐1】如图,已知直线l和l外一点P,用直尺和圆规作⊙P,使它与l相切于点A(保留作图痕迹,不写作法).
![](https://img.xkw.com/dksih/QBM/2022/1/2/2885634340356096/2885985955725312/STEM/1ad2c4d2-9afa-43b3-a0ab-4d20b02756a2.png?resizew=179)
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【推荐2】如图,水平放置一个三角板和一个量角器,三角板的边
和量角器的直径
在同一条直线上,AB=BC=40cm,OD=20cm.
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991168381788160/2991724770803712/STEM/672ce3b1-299b-42b0-a70b-a945c535645f.png?resizew=253)
(1)如图①,当
与量角器的半圆相切时,求
的长;
(2)如图②,当
和
重合时,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991168381788160/2991724770803712/STEM/672ce3b1-299b-42b0-a70b-a945c535645f.png?resizew=253)
(1)如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ec5b897a332b8accfdb1b70d7878174.png)
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