如图,四边形
内接于⊙O,BD是⊙O的直径,AE是⊙O的切线,
交CD的延长线于点E.
(1)求证:DA平分
;
(2)若
,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/39fbeb58-2a3c-42c7-9b85-8a1d687b747e.png?resizew=121)
(1)求证:DA平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46136e1230ce514e8aca50e9807c2b19.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbc450b6d4024ee9a0c47556ff660aa.png)
更新时间:2023-06-10 20:23:33
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相似题推荐
解答题-问答题
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名校
【推荐1】如图,在平面直角坐标系中,等边三角形
的边
在
轴的正半轴上,顶点
落在第一象限,已知点
的坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/e9560df1-b46c-4c2b-b47b-91aaeed2a540.png?resizew=183)
(1)求
点的坐标;
(2)若点
在第二象限,连接
、
,且满足
的面积为
,求线段
的长度;
(3)在(2)的条件下,点
是
轴上一动点,当
为等腰三角形时,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/edb13bbc5335efc427f9c619a51dae3c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/e9560df1-b46c-4c2b-b47b-91aaeed2a540.png?resizew=183)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac2271c330720b097ad812cd3420666.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c512163910e922cecdf3a62cca57f493.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40c49d6e2fc6fbdc21ff61841b586a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】长沙市华益中学秉承“公朴仁毅”的校训,坚守“让生命温暖而幸福,让每个生命向光而行”
的办学理念:一所有温度的学校最值得向往!我们约定:对于任意点
且满足
,令
,则称
是点
的“华益值”,例如:点
的“华益值”即为
.
(1)求点
的“华益值”;
(2)已知
三点的“华益值”满足:
,求
的值;
(3)若实数
是一个直角三角形的三条边,点
的“华益值”是
,求点
到原点O的距离.
的办学理念:一所有温度的学校最值得向往!我们约定:对于任意点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9395233f32dbda8c663c59114cb6a652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23afbf1c018e3e3f903a382294d5cdc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62d7b7f86c808602eab44cc37fbcc520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b39f102a547d063e5a1a92666a555c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a32d5c1e8d6784f7e7038a58f94f21.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5230a6a6a7044bc4b47c4fb4e5507735.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7cccb98e939dd2cd17805fa5064b78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907bbdc453992335ffeced604c98c9bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)若实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a680e83e3107e2a9febe8416dfc8b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1e4f15c8921349f6576391c3fc7e38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35fc2c1fa9b15a396d019a6d5e6395ea.png)
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【推荐1】如图,四边形
中,
,
,
,
,
,动点P从点C出发,以每秒1个单位的速度向终点D运动;同时动点Q从点A出发,以每秒2个单位的速度向终点B运动.连接
,当P、Q有一个抵达终点则运动停止,设运动时间为t秒.
(1)边长
______;
(2)E为
中点,连接
,求出四边形
的面积S关于t的表达式;
(3)以线段
为边作等边三角形
,是否存在时刻t,使得点F恰好在直线AB上?存在,请直接给出相应的t值,不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd90bfa2987b84df430498021d5f648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df049f15adb6667113ceee3a6638cd0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/266bc68d82a8855ec1b54a7b1d98c44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/10/707a02f6-48f0-4a88-8d8d-f390018d4d7c.jpg?resizew=409)
(1)边长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
(2)E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ceaa2cfd4df791e35e0bb6223c089db.png)
(3)以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbd36496e3751b0d35b6a9be53bf058.png)
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【推荐2】脱贫攻坚工作让老百姓过上了幸福的生活.如图①是政府给贫困户新建的房屋,如图②是房屋的侧面示意图,它是一个轴对称图形,对称轴是房屋的高
所在的直线.为了测量房屋的高度,在地面上
点测得屋顶
的仰角为
,此时地面上
点、屋檐上
点、屋顶上
点三点恰好共线,继续向房屋方向走
到达点
时,又测得屋檐
点的仰角为
,屋顶到横梁的距离
,
,
交
于点
(点
在同一水平线上),求房屋的高
.(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/f6b86c22b670a8e9f3896f9e8883fbbb.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167e6e41ac221847824a72e964f340f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022805c8b747adad1481b98d8c307141.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4fe71c95203f7a3717bb451beb0e7b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0869ff36d886da4455f3e2ad7c094b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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真题
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【推荐1】如图,⊙O的直径AB垂直于弦CD,垂足P是OB的中点,CD=6 cm,求直径AB的长.
![](https://img.xkw.com/dksih/QBM/2011/1/21/1577484244762624/1577484410380288/STEM/74b58220-9c29-433a-b4f3-10bf8b6fb13e.png)
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【推荐2】如图,
是
的直径,
是
的弦,
与
交于点E,
,延长
至点F,连接
,使得
.
(1)求证:
是
的切线;
(2)已知
,
,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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f0605b1f23461e980f27ef18550676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e332260a91c61ef9a1b353cb9d00cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/23/39a9a7e3-4491-4746-87f5-fd7de7b59488.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc90c2d45477e166b02359525f40aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐1】如图,
是
的直径,
是
的切线,
交
于另一点D,且
,
;
(2)若E为
的中点,
,连接
,求
的长及阴影部分的面积.
![](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/9b1ec05e3cec27677ded7b4aecaa62d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7bf58e5fea1189b33cf55d86335452f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03792cfb2b3540e9f8992d6daa36700d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02bcc1b9b8eec9d79f0d507b968d9ade.png)
(2)若E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c44512cb86bcf48c6d21357f45b533.png)
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解答题-作图题
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适中
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【推荐2】如图,
为
的直径,点
是
上一点,
平分
,交
于点
,
、
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/c750685a-5e72-438b-bf60-a72885ed2c72.png?resizew=164)
(1)画出过点
的
的切线,且交
的延长线于点
;
(2)在(1)的条件下,
①求证:
;
②若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/c750685a-5e72-438b-bf60-a72885ed2c72.png?resizew=164)
(1)画出过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)在(1)的条件下,
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77d95ba804719af7f1654f8512d0f2e0.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432cce1481829c4dfe2bd557f6e9aa4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
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