如图,已知
,
,
,
四点在同一条直线上,
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/c65a598d-785c-47ee-b533-d859d4352453.png?resizew=224)
(1)求证:
.
(2)如果四边形
是菱形,已知
,
,
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/d3bc0cc876a60c8cbdccc6a9a0b5b993.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a9cdc8aae01c982eb8939a605e5004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06cd62abe5e301e96111b5060d0c456c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/c65a598d-785c-47ee-b533-d859d4352453.png?resizew=224)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0922341910e07e79a2dc6cdd587a5ce6.png)
(2)如果四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d1a8ed65b138016acff8c465165337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1496042c1d721cffd25053e997a9a97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/617d321a9e88d1001fba9283c89b99b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
18-19八年级下·浙江湖州·期末 查看更多[4]
2019年浙江省湖州市长兴县八年级下学期期末考试数学试题(已下线)第09讲 菱形的性质与判定-【寒假自学课】2023年八年级数学寒假精品课(人教版)山东省枣庄市薛城区北临城中学2022-2023学年九年级上学期10月月考数学试题新疆维吾尔自治区乌鲁木齐市新市区新疆师范大学附属中学2022-2023学年八年级上学期期末数学试题
更新时间:2019-09-19 13:17:04
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】已知:如图,在正方形
中,
为
边上的一点,
为
的延长线上一点,且
.
与
全等吗?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13668f033d00acfc366f7e47949c4462.png)
![](https://img.xkw.com/dksih/QBM/2022/11/26/3117843001876480/3175903697125376/STEM/12c4173771e54730bd7dcc6dd7822f64.png?resizew=141)
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【推荐2】如图,点E为矩形ABCD外一点,AE = DE.求证:△ABE≌△DCE
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892979567083520/2893520641687552/STEM/74b2bc65-ca13-44ca-afda-e9957e8d0975.png?resizew=155)
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【推荐1】如图,AB是⊙O的直径,点C在AB的延长线上,AD平分∠CAE交⊙O于点D,且AE⊥CD,垂足为点E.
![](https://img.xkw.com/dksih/QBM/2022/3/10/2933349792210944/2951819462017024/STEM/dfccfe6d-344b-4d80-98dd-4a4146aac3f1.png?resizew=166)
(1)求证:直线CE是⊙O的切线.
(2)若BC=2,CD=2
,求弦AD的长.
![](https://img.xkw.com/dksih/QBM/2022/3/10/2933349792210944/2951819462017024/STEM/dfccfe6d-344b-4d80-98dd-4a4146aac3f1.png?resizew=166)
(1)求证:直线CE是⊙O的切线.
(2)若BC=2,CD=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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【推荐2】如图1,在
中,
,
,
于点
,
,将
绕点
顺时针旋转,它的两边分别交
、
于点
、
.
![](https://img.xkw.com/dksih/QBM/2023/2/20/3178835721510912/3183069383573504/STEM/0dc90addf9614b11975350986af127f6.png?resizew=494)
(1)求证:
;
(2)连接
,若
,求
的长;
(3)如图2,若
,连接
、
,并延长
分别交
、
于点
、
.
① 求证:
;
② 猜想
与
有怎样的特殊位置关系?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4300aefd67369742e2b1ddcdc02dd495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ef9c0041c704ad84db5683c484f3acf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8648cc68448cb78e36cff296b912ea46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d631e2e8b2a5397b2ff76911df0fb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fba7a5655c37964678c12c9f75f896ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2023/2/20/3178835721510912/3183069383573504/STEM/0dc90addf9614b11975350986af127f6.png?resizew=494)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c47b1a156bbac2419dca79baa42b2159.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db284d584b97947cfcbb053cde82f0d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ef28500b29b188ac719e2e1bdae8e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0e65e147b109f2bbfd3a3f502bbc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccfff99dd307eb936b5e5263e43ca510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccfff99dd307eb936b5e5263e43ca510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef9d0784478511736255074b9395fae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0e65e147b109f2bbfd3a3f502bbc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
① 求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f6c59dc7cabd685c8a09982c566433.png)
② 猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f816fb1c924a3c07a051b5621634e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0e65e147b109f2bbfd3a3f502bbc3a.png)
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【推荐3】秦九韶(1208~1268年),字道古,南宋著名数学家,与李冶、杨辉、朱世杰并称宋元数学四大家.他精研星象、音律、算术、诗词、弓剑、营造之学,他于1247年完成的著作《数学九章》中关于三角形的面积公式与古希腊几何学家海伦的成果并称“海伦-秦九韶公式”.它的主要内容是,如果一个三角形的三边长分别是
,
,
,记
,
为三角形的面积,那么
.
中,
,
,请用上面的公式计算
的面积.
(2)如图1,在
中,
,
,
,
,垂足为
,求
的长;
(3)如图2,在
中,
,
,
,垂足为
,
的平分线交
于点
.求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f2d50ca5cc415bf6721faf2221d626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684c13a2cea962fb204256ca433a4d58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c05bbc5dbc0cd9ba0414ee79f501db9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae8221601c7bd5c51fd520615581fa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/040819c1ee044ec6dc1dfb1dd8e3e9bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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解答题-证明题
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【推荐1】四边形ABCD是菱形,∠ABC=60°,E是对角线BD上的一个动点,连接AE,将线段AE绕点A逆时针旋转120°得到线段AF,连接EF,DF.
(1)如图1,求∠BDF的度数;
(2)如图2,当DB=3DF时,连接EC,求证:四边形FECD是矩形;
(3)若G为DF中点,连接EG,当线段BD与DF满足怎样的数量关系时,四边形AEGF是菱形,并说明理由.
(1)如图1,求∠BDF的度数;
(2)如图2,当DB=3DF时,连接EC,求证:四边形FECD是矩形;
(3)若G为DF中点,连接EG,当线段BD与DF满足怎样的数量关系时,四边形AEGF是菱形,并说明理由.
![](https://img.xkw.com/dksih/QBM/2021/12/5/2866154908131328/2866682590158848/STEM/14c3af1d-cfce-42c4-a987-45c8e74b8a2e.png?resizew=589)
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名校
【推荐2】如图,在菱形
中,分别过点B作
于点M,
于点N,
分别交
于E、F两点.
![](https://img.xkw.com/dksih/QBM/2021/3/10/2674786620014592/2675454563041280/STEM/66fba6ff-ed56-48bc-b98c-202c65363a7c.png)
求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb350b8e577a7b6712031a3b5b98309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e2a567ce6cf6140dee90789092342e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b17ea2e14f8d2f1af7876eeb79b0c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2021/3/10/2674786620014592/2675454563041280/STEM/66fba6ff-ed56-48bc-b98c-202c65363a7c.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
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