如图,
是等边三角形,
,连接
,
,
,求出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6662097cf94dc37facdaba44b49966d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432cce1481829c4dfe2bd557f6e9aa4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2021/4/29/2710168850628608/2710494586478592/STEM/3c91af25680243f6816cc652edade77a.png?resizew=114)
20-21八年级上·浙江·期中 查看更多[2]
更新时间:2021-04-29 22:18:15
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相似题推荐
解答题-证明题
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适中
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【推荐1】如图,在
中,
,点
分别在
边上,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/78e65ba9-bd9b-437e-9236-e00e1bf544f3.png?resizew=86)
(1)求证:
是等腰三角形;
(2)当
时,求
的度数;
![](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/798d1b0413011178ffde4c8f446fed40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/633ac971ea83bf9dfc1fc441a3b0030f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/78e65ba9-bd9b-437e-9236-e00e1bf544f3.png?resizew=86)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e56feb858a38f68412d4d7691fcf86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
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【推荐2】已知:在
中,
,点
在直线
上,连接
,在
的右侧作
.
(1)如图1,①点
在
边上,线段
和线段
关系是________;
②直接写出线段
之间的数量关系________;
(2)如图2,点
在
右侧.请写出线段
之间的数量关系,并说明理由;
(3)拓展延伸
如图3,
,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6bf51a00d91a320c0ccf28f0bedd6bc.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10619c5ed44b835d3ef830ce08aabb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/1ae96f2a-7d82-4a65-96a4-ba7bd75e502a.png?resizew=360)
(1)如图1,①点
![](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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
②直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8264be48e81693b8386ed70a45f3d07f.png)
(2)如图2,点
![](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/8264be48e81693b8386ed70a45f3d07f.png)
(3)拓展延伸
如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff2e8d3bb776dea3f860b44ce48fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
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【推荐1】(1)如图1中,△ABC为正三角形,点E为AB边上任一点,以CE为边作正△DEC,连结AD.求
的值.
(2)如图2中,△ABC为等腰直角三角形,∠A=90°,点E为腰AB上任意一点,以CE为斜边作等腰直角△CDE,连结AD.求
的值;
(3)如图3中,△ABC为任意等腰三角形,点E为腰AB上任意一点,以CE为底边作等腰△DEC,使△DEC∽△ABC,并且BC=
AC.连结AD,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4907f159ff9c4caacf266db591588.png)
(2)如图2中,△ABC为等腰直角三角形,∠A=90°,点E为腰AB上任意一点,以CE为斜边作等腰直角△CDE,连结AD.求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4907f159ff9c4caacf266db591588.png)
(3)如图3中,△ABC为任意等腰三角形,点E为腰AB上任意一点,以CE为底边作等腰△DEC,使△DEC∽△ABC,并且BC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d249094ecb996458e35182d6b461299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4907f159ff9c4caacf266db591588.png)
![](https://img.xkw.com/dksih/QBM/2019/8/16/2269901917356032/2270193254948864/STEM/ac330613975540c68d190e25aa08d3a5.png?resizew=468)
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解答题-证明题
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【推荐2】如图1,
和
都是等边三角形,点C在线段
上(点C不与A,B重合),连接
,
交于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/3f43c024-ff16-4065-8766-49a02e0839a5.png?resizew=369)
(1)求证:
;
(2)猜想
的度数为________,并说明理由;
(3)拓展:如图2,当点C在线段
外时,依然作等边
和等边
,
和
还全等吗?若全等,请证明你的猜想;若不全等,请说出你的理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/3f43c024-ff16-4065-8766-49a02e0839a5.png?resizew=369)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a08312e180b01d2cc9c1a22a871b1180.png)
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fa5dff377ef08e416547def489def0.png)
(3)拓展:如图2,当点C在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f0dadf037efedc90b39c57a6880a1a.png)
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【推荐1】如图所示,在
中,
的平分线
交
于点
垂直平分
,
的度数;
(2)当
时,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e374b52fe1d687e3e06e83825f99fa4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2427839cd5ff4ff5d5675ef3dadeff0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】如图,在建筑物DF的左边有一个小山坡,坡底B、C同建筑底端F在同一水平线上,斜坡AB的坡比为
,小李从斜坡底端B沿斜坡走了26米到达坡顶A处,在坡顶A处看建筑物的顶端D的仰角α为
,然后小李沿斜坡AC走了
米到达底部C点,已知建筑物上有一点E,在C处看点E的仰角为
,(点A、B、C、D、E、F在同一平面内)建筑物顶端D到E的距离DE长度为28.8米,求建筑物DF的高度.(参考数据:
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc71617053dae2a2182ef840830279d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e374bcad4e137e15ffc8eada1dbcf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15290636f0e4f118879764437bc2133f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7aa1465046b5d442fca5102f8e62ed8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ae4e52cbc8048502f08fbc0bfedad24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95f0196b362c7c6b8be4074eeabd4566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfc83df65c0168c6fd981e655eb95a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc2956ef633a21eef21dee05d41aeb5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/ce390ee6-69bb-4c30-84d3-b58d07b3ae78.png?resizew=213)
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