(1)【探究证明】如图①,在
中,
,
平分
交
于点D,求证:
;
(2)【拓展延伸】如图②,在
中,对角线
相交于点O,E为
上一点,
交
的延长线于点F,且
.
①求证:四边形
是菱形;
②
交
于点G,若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d00f4651b343dd8f9060c6460f0c955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe4ca2c0c1e549aa53de2da13145eff.png)
(2)【拓展延伸】如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d52052ac065bb3ba72303d6b0c73630.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9a9618018d717926540d1452f76e44.png)
①求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9fe98212335b40e665b08b580c8efd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a3a35edb1ee5be5be9d28ff440f27c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/588c962f-12f1-42ca-a486-6f8ccea98fb9.png?resizew=556)
更新时间:2023-02-20 22:07:14
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在平行四边形
中,点
是对角线
上一点,连接
并延长至点
,使
,连接
,
.
(1)求证:
;
(2)当
,
时,试说明四边形
为矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c9d944fb5c36f5cc3ab3c35bc6ccbb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/22/d76f3fe9-1172-411e-b8e6-b5e7a464640c.png?resizew=220)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f81511fc0191e203b8a6c0a7f8995d3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019a351c8982e78e7c69503880e2f7a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0736baa76b9da0cca1460eeb46dab15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4be0d7df9ff80ee4b065eab40b97b060.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,平行四边形
,
,E、F分别是边
上的两个动点,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/81eae26e-a5e9-412d-9207-05d186789340.png?resizew=197)
(1)求证:
;
(2)判断
的形状,并说明理由.
(3)
的周长是否存在最小值,若存在,请直接写出
周长的最小值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762cd2d2e0550938fe77347b4a3a42ba.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd62b004acf6e16131548aecdb50a18.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】在平行四边形
中,
是
的中点,过
作
,分别交
,
于点
,
,连接
,
.
是菱形;
(2)若
平分
,且
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb6823a329628699619a39cde927510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ccaabd4d88998c68a609d23f4a08b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,AC是菱形ABCD的一条对角线,过点B作BE∥AC,过点C作CE⊥BE,垂足为E,请你用两种不同的方法,只用无刻度的直尺在图中作出一条与CD相等的线段.
![](https://img.xkw.com/dksih/QBM/2019/4/14/2182107135713280/2182963111837696/STEM/79c32facd071499d843c83834ba98141.png?resizew=252)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,已知△ABC内接于⊙O,AB是直径,OD∥AC,AD=OC.
![](https://img.xkw.com/dksih/QBM/2020/2/13/2398159848669184/2399020576432128/STEM/2124f008c2ed440ab5653167a3af158f.png?resizew=137)
(1)当∠B=30°时,请判断四边形OCAD的形状,为什么?
(2)当∠B等于多少度时,AD与⊙O相切?请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/2/13/2398159848669184/2399020576432128/STEM/2124f008c2ed440ab5653167a3af158f.png?resizew=137)
(1)当∠B=30°时,请判断四边形OCAD的形状,为什么?
(2)当∠B等于多少度时,AD与⊙O相切?请说明理由.
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,在
中,
为钝角.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/1d6e7a36-34c7-49f6-88bf-535fcb7c3c3d.png?resizew=226)
(1)尺规作图:在边
上确定一点D,使
(不写作法,保留作图痕迹,并标明字母);
(2)在(1)的条件下,
是 三角形.
(3)在前两问的条件下,将
沿BC翻折得到
.
①请尺规作图画出E点(不写作法,保留作图痕迹,并标明字母);
②四边形
是什么特殊图形?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/1d6e7a36-34c7-49f6-88bf-535fcb7c3c3d.png?resizew=226)
(1)尺规作图:在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f116fa8398e4b62db9ca01693c2a475.png)
(2)在(1)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
(3)在前两问的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6818a98204f62c1b16699d26ca0c3f62.png)
①请尺规作图画出E点(不写作法,保留作图痕迹,并标明字母);
②四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3627ca1fc77141bb7d6d3f9b2473ed3.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,在由边长为1个单位长度的小正方形组成的网格中,
的顶点均为格点(网格线的交点).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/31/ee38f245-0c25-4aaf-b520-85745e736c96.png?resizew=147)
(1)以点
为旋转中心,将
按逆时针方向旋转
,得到
,画出
;
(2)用无刻度直尺画图(要求:保留关键作图痕迹,无需写作法)
①过点
作
的垂线,交
于点
,并标出点
;
②在
上找一点
,使得
,并标出点
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/31/ee38f245-0c25-4aaf-b520-85745e736c96.png?resizew=147)
(1)以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7988923407b9abb78ef8ab45829678fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7988923407b9abb78ef8ab45829678fa.png)
(2)用无刻度直尺画图(要求:保留关键作图痕迹,无需写作法)
①过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d760f0d2feb36b066350ee7c1e3a7a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】已知:如图,在
中,
,点D、E分别是边
、
的中点,
,
与
相交于点F,
的延长线与
相交于点G.
(1)求证:
;
(2)求证:
.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/14bb5117-c777-4e8d-a37a-039ca186cf52.jpg?resizew=108)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571ffae2f77df57a8e121fdb1ec02bb5.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87ede886f344f253419ce19b9f6f9c13.png)
您最近一年使用:0次