如图,已知:
和
都是等边三角形,点
分别是
上的点,点
是线段
延长线上的一点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/f8184664-4061-43f2-98c0-308da41df28a.png?resizew=294)
(1)如图1,求证:
;
(2)如图1,若
,求证:
;
(3)如图2,在(2)的条件下,点
是线段
的中点,连接
并延长至
使得
,
交
于
,连接
,求证:
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5a0a6e5b3f489a7032ea5116c96024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5cc42088b0a16d058745d2ff784f3ad.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/f8184664-4061-43f2-98c0-308da41df28a.png?resizew=294)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333ab24c4935210f4c232cd0c0fae358.png)
(2)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ece8a7a410a8379e27c3d7dc03eb973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
(3)如图2,在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2e305fce082bdea5f8205833179992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831b15fefc14b367f23d832f22e968ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e50ffaba29591d84ffa294bb817acae.png)
更新时间:2024-03-04 17:35:17
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相似题推荐
解答题-问答题
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【推荐1】如图1,直线
分别与x轴、y轴交于A、B两点,
平分
交
于点C,点D为线段
上一点,过点D作
交y轴于点E,已知
,且m、n满足
.
(1)求A、B两点的坐标?
(2)若点D为
中点,求
的长?
(3)如图2,若点
为直线
在x轴下方的一点,点E是y轴的正半轴上一动点,以E为直角顶点作等腰直角
,使点F在第一象限,且F点的横、纵坐标始终相等,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa317c983e05adf97f25ba296d367fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9aa13b32914e4f74bde13becf2acd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962be3d55f7c9294b7afa5d916aeeb24.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/18/503fa4e2-1856-4f2e-b170-2558f6008fc3.png?resizew=317)
(1)求A、B两点的坐标?
(2)若点D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
(3)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d94ce46cf1fbd99944f1c8ed06a1fe88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b51d3992644d37dc71c9b5a97d515c.png)
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【推荐2】如图,△ABC中, ∠BAC=∠ADB,BE平分∠ABC交AD于点E,交AC于点F,过点E作EG//BC交AC于点G.
(1)求证: AE=AF;
(2)若AG=4,AC=7,求FG的长.
(1)求证: AE=AF;
(2)若AG=4,AC=7,求FG的长.
![](https://img.xkw.com/dksih/QBM/2017/7/20/1733987747782656/1734370138808320/STEM/3a75721d-75fc-48f3-8d96-48a2f31ce332.png?resizew=180)
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【推荐3】综合与探索
在四边形
中,
分别是
上的点,且
,试探究图1中线段
之间的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/90dd6b01-379a-47e7-b4b3-e5e2d02e5a7c.jpg?resizew=450)
(1)【初步探索】
小亮同学认为:延长
到点
,使
,连接
,先证明
,再证明
,则可得到
之间的数量关系是______.
(2)【探索延伸】
在四边形
中如图2,
分别是
上的点,
,上述结论是否仍然成立?说明理由.
(3)【结论运用】
如图3,在某次军事演习中,舰艇甲在指挥中心(
处)北偏西
的
处,舰艇乙在指挥中心南偏东
的
处,并且两舰艇到指挥中心的距离相等,接到行动指令后,舰艇甲向正东方向以50海里/小时的速度前进,舰艇乙沿北偏东
的方向以70海里/小时的速度前进1小时后,指挥中心观测到甲、乙两舰艇分别到达
处,且两舰艇之间的夹角(
)为
,试求此时两舰艇之间的距离.
在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103bdb4538da80b37c55de65126bb874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030c278b9b5337b36c0db5c2feb014f7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/90dd6b01-379a-47e7-b4b3-e5e2d02e5a7c.jpg?resizew=450)
(1)【初步探索】
小亮同学认为:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc180eda08edfb6d54eb04da7741f099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac09e961b25848c2860065aa8f577e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/382dcc8aa37ed16c588b41888c3906a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030c278b9b5337b36c0db5c2feb014f7.png)
(2)【探索延伸】
在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab526d8f67ed15914043a86528d57389.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.png)
(3)【结论运用】
如图3,在某次军事演习中,舰艇甲在指挥中心(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31a14bd2a972f43d7a26a99589ad083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/225803a7818b0985a1b96d8e0a627251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb94bd9eb80fb9f5f02f518bb8f2211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aa0b9869db50a9ab48cc32925d8e96.png)
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【推荐1】如图,以边长为
的正三角形纸板的各顶点为端点,在各边上分别截取
长的六条线段,过截得的六个端点作所在边的垂线,形成三个有两个直角的四边形.把它们沿图中虚线剪掉,用剩下的纸板折成一个底为正三角形的无盖柱形盒子,求它的容积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe9f7abf7bcf4e1aa2579cd191d7761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab4a92bf822e175d370e6d0c8a730.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/58419997-bd57-4c00-8cf2-6e6c1ffe8034.png?resizew=224)
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【推荐2】如图,
为等边三角形,
,
、
相交于点P,
与Q,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/b584ef82-10bd-405c-af09-adbb2ebcce3d.png?resizew=158)
(1)求
的度数;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35a7b005ce1340b09b2657fb96532a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42a8ba3ea434605e0574339efc9c38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79012f04b8cc315d382edf4f953c06f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/b584ef82-10bd-405c-af09-adbb2ebcce3d.png?resizew=158)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb967f3188ad239a78047edf98458d6.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐1】如图所示,
是
的角平分线,
是
的垂直平分线,分别交
、
的于点
、
,连结
,
;
(2)若
,试判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105068b25f5a63af32f4082cfe08691e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe6d389a6c448d92b79d89bc9e8489f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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【推荐2】如图,在
中
,以
为直径的
交
于点D,过点D作
于点E,交
的延长线于点F.
![](https://img.xkw.com/dksih/QBM/2023/1/28/3162718525284352/3163834858061824/STEM/475cbc33ef094af2802568c7fac29247.png?resizew=216)
(1)求证:
是⊙O的切线;
(2)若点E是
的中点,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2023/1/28/3162718525284352/3163834858061824/STEM/475cbc33ef094af2802568c7fac29247.png?resizew=216)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)若点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9391825004ba800b43827ad6d86f42.png)
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