如图,
是等边三角形,
为
的中点,
于点
,
交
于点
,已知
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/5b84c9d873289f99d8eb733d12899280.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058f36d315245b63a811d5c6f348c17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba3ae8b7b9f2698cca3c374d39650d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5a0a6e5b3f489a7032ea5116c96024.png)
![](https://img.xkw.com/dksih/QBM/2020/3/12/2417898536706048/2417949398663169/STEM/262f7716eb954048bcd7748dd207e925.png?resizew=174)
19-20八年级上·浙江杭州·期末 查看更多[1]
(已下线)【新东方】初中数学726【2019年】【初二上】
更新时间:2020-03-12 14:33:33
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相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】在平面直角坐标系中,已知点A在第一象限,点B在y轴的正半轴上
,且有
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/6685dd91-71d7-41ac-9575-035b5cf9b6f3.png?resizew=398)
(1)请判断
的形状,并说明理由;
(2)如图①,
,且
,点D为
的中点,
和
交于点E,求证:
;
(3)如图②,P点在点B的上方运动,以AP为边在第一象限内作一个等边
,延长
交x轴于点G.已知
,直接写出
的长度为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf2424894d813775f5912b77b2400f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/286b2d91c15fc031c7c4c4ffb2983386.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/6685dd91-71d7-41ac-9575-035b5cf9b6f3.png?resizew=398)
(1)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
(2)如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7389dc7c81a87a2460b994c561dca4ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb0cb135b77b10612f470c5035dabd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6076567bc723f6cf64a924c6ed299a17.png)
(3)如图②,P点在点B的上方运动,以AP为边在第一象限内作一个等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab0b1e01acda65d721a9ec31a0dcafa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af464ddb07308be2cd6f02e61fd08eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/def4f2e101a80da9bec891ee951b5022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999a995a6d07c561ce64e8952994160a.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,在
中,
,直线
垂直平分
,交
于点
,交
于点
,且
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72a9f29a26bd9d740620c6f270d2c025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/1266ec05c978f46b9de260bc9b4cd608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2020/2/21/2404001798995968/2404609712939008/STEM/d64f615191e24f678fed6ee1a13a48cf.png?resizew=232)
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解答题-证明题
|
适中
(0.65)
【推荐1】已知⊙O是等边三角形ABC的外接圆,P为劣弧BC上一点(点P与点B,C不重合).
(1)如果P是劣弧BC的中点,求证:PB+PC=PA;
(2)当点P在劣弧BC上移动时,(1)中的结论还成立吗?请说明理由.
(1)如果P是劣弧BC的中点,求证:PB+PC=PA;
(2)当点P在劣弧BC上移动时,(1)中的结论还成立吗?请说明理由.
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解答题-证明题
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适中
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解题方法
【推荐2】如图,点
是线段
上一动点,
均为等边三角形.连接
和
分别交
于点
交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2020/12/2/2605689999081472/2609681790337024/STEM/2d9144ac-bfd2-4fa8-8b12-b5f96e14f181.png)
(1)求证:
;
(2)设
,那么
的大小是否随
的位置变化而变化?请说明理由;
(3)证明:
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbd854f3ca52c01ef9c1d9ddb5e82a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d392690845f0d5731bfd924578b0492b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8675339af8e4efed96e57f60cd6c3b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8941ed5d5b5092e8d10eb4b8cba4e0df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://img.xkw.com/dksih/QBM/2020/12/2/2605689999081472/2609681790337024/STEM/2d9144ac-bfd2-4fa8-8b12-b5f96e14f181.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/387cb1a9bbf3452f9ead3697ce02eb0e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d76194e3b39df69682b03b28b32697d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd9311e5295f10061deb2872fe04af5.png)
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