如图,在等腰
中,
,以
为直径作
交
于点D,过点D作
,垂足为E,延长
交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/d6476a10-29f0-4aab-b661-2b9b08f04a55.png?resizew=178)
(1)求证:
是
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b49022a6f55817b5d7e3ab443b5491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/d6476a10-29f0-4aab-b661-2b9b08f04a55.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad46b2b147ad351a2b8b5a04d3e980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4a7376fe01a2791ed6a39699433f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
更新时间:2023-12-25 10:25:50
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】综合与实践
实践操作:有一组邻边相等,并且有一个角是直角的平行四边形是正方形,因此,正方形是四边相等,四角相等的四边形.
某校初二社会实践班开展了一次课外活动,具体过程如下:如图①,正方形
中,
,将三角板放在正方形
上,使三角板的直角顶点与
点重合.三角板的一边交
于点
,另一边交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/c8969098-ef4f-472c-924c-9d090d8b75c4.png?resizew=227)
解决问题:
(1)线段
与线段
的关系是_________;
(2)如图②,小明在图1的基础上作
的平分线
交
于点
,连接
,他发现
和
的数量关系是_________,请予以证明;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/e4940d4c-a6c6-4dc4-8dab-73cd3b3d2bda.png?resizew=242)
拓展延伸:
(3)在(2)的条件下,若
,则
的长为_________.
实践操作:有一组邻边相等,并且有一个角是直角的平行四边形是正方形,因此,正方形是四边相等,四角相等的四边形.
某校初二社会实践班开展了一次课外活动,具体过程如下:如图①,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/c8969098-ef4f-472c-924c-9d090d8b75c4.png?resizew=227)
解决问题:
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
(2)如图②,小明在图1的基础上作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46060ff16376f584eb554e09686ab703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/e4940d4c-a6c6-4dc4-8dab-73cd3b3d2bda.png?resizew=242)
拓展延伸:
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】已知正方形
,F是
上一点,以
为斜边作等腰
,点H是
延长线上一点,过点E作
交
边于点G.
(1)如图①,求证:
;
(2)如图②,当
时,连接
,求证:
且
;
(3)在图②中连接
,若
,
,直接写出四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d7ba21ae550ce76068394a454a9ed22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036dc5b3afa5ee5b159f5f0c0d24b739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/88d2e608-c918-4dfe-939b-35d7a978f578.png?resizew=448)
(1)如图①,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce9b74a6609450a154847baa28fe0382.png)
(2)如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd7927c2b679765a7328e54926a453c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0ae50d5993a332b5cddb022eaa6f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f3b7cfd5a7f01bae9add9a26587566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693d909f77a28e8e4b2d627d930070f7.png)
(3)在图②中连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa9e716ca556082406c04f9e55c16536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7de355def29ad1bb9d1596d2ce6c51.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】若一个四边形的两条对角线互相垂直且相等,则称这个四边形为“奇妙四边形”,如图1,四边形ABCD中,若
,AC⊥BD,则称四边形ABCD为奇妙四边形,根据“奇妙四边形”对角线互相垂直的特征可得“奇妙四边形”的一个重要性质:“奇妙四边形”的面积等于两条对角线乘积的一半,根据以上信息回答:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/63ed47d9-3084-4113-831b-0f3c871a8aa8.png?resizew=500)
(1)写出一种你所知道的特殊四边形中是“奇妙四边形”的图形名称______.
(2)如图2,已知四边形ABCD是“奇妙四边形”,且A,B,C,D在⊙O上,若⊙O的半径为6,
,求“奇妙四边形”ABCD的面积,
(3)如图3,已知四边形ABCD是“奇妙四边形”,且A,B,C,D在⊙O上,作OM⊥BC于M,请猜测OM与AD的数量关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/63ed47d9-3084-4113-831b-0f3c871a8aa8.png?resizew=500)
(1)写出一种你所知道的特殊四边形中是“奇妙四边形”的图形名称______.
(2)如图2,已知四边形ABCD是“奇妙四边形”,且A,B,C,D在⊙O上,若⊙O的半径为6,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ec435aa1401dbce7863b531bf2f3e5.png)
(3)如图3,已知四边形ABCD是“奇妙四边形”,且A,B,C,D在⊙O上,作OM⊥BC于M,请猜测OM与AD的数量关系,并证明你的结论.
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解答题-问答题
|
适中
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【推荐2】如图,已知
的半径为5,圆内有一定点P,且
,过点P引两条互相垂直的弦
.
(1)当
时,求
的长.
(2)求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637331a6bcf269d7d3487ee4cfb536f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/abd14335-9c25-49b3-bc4f-98f43e14ae66.png?resizew=134)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1aac055263010139f6eb4df68f9d619.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知:如图,点A、B、M在
上,且满足
,连接
,
.过点B作直线
,交
的延长线于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/57102f66-4a80-4eab-8c42-7b33f682f5b5.png?resizew=181)
(1)求证:
是
的切线;
(2)如果
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b8c7a04f2aeefb9d0eefc23ffb1499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8913d6a8e5021895e6ee06f9c067270d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/57102f66-4a80-4eab-8c42-7b33f682f5b5.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9419302c045670b2f7384d6b0e7b7738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b947acc328f9561e1d7b78f9bbed9263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,
是
的外接圆,
是
的直径,
是
延长线上的一点,连接
,且
,
.
(1)求证:
是
的切线.
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df7fc746f8c4801d8f2f0471ba3297e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a1d4c140243ba9a9bd7256ec2bbce6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/012bdbb1-0134-4e5e-8b68-1e7ab9be4adc.png?resizew=146)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次