已知:如图,在△ABC中,点D、E分别在边AB、AC上,∠ADE=∠B,AB=2AD,BC=6cm,∠A=58°,∠ADE=40°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/d23d129e-3228-4d1b-8342-d00f2bac5cc2.png?resizew=198)
求:
(1)∠ACB的度数;
(2)DE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/d23d129e-3228-4d1b-8342-d00f2bac5cc2.png?resizew=198)
求:
(1)∠ACB的度数;
(2)DE的长.
21-22九年级上·湖南邵阳·期末 查看更多[2]
湖南省邵阳市邵东市2021-2022学年九年级上学期期末数学试题(已下线)专题07 相似三角形常考的模型及压轴题-【好题汇编】备战2023-2024学年九年级数学上学期期末真题分类汇编(湖南专用)
更新时间:2022-05-03 10:44:46
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解答题-证明题
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解题方法
【推荐1】已知:如图1,
AOB和
COD都是等边三角形.
(1)求证:①AC=BD;②∠APB=60°;
(2)如图2,在
AOB和
COD中,OA=OB,OC=OD,∠AOB=∠COD=α,则AC与BD间的等量关系为 ,∠APB的大小为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)求证:①AC=BD;②∠APB=60°;
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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名校
【推荐2】如图,点D、点E分别在
边
上,
,
的平分线交
于F点.
;
(2)如图1,如果
的平分线与
交于G点,
,求
的度数.
(3)如图2,如果H点是
边上的一个动点(不与B、C重合),
交
于M点,
的平分线
交
于N点,当H点在
上运动时,
的值是否发生变化?如果变化,说明理由;如果不变,试求出其值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dd78cc5310fd387d75f340764d10ccf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c66a08f614ede700d99793f2da38ea6.png)
(2)如图1,如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f00a9f52934331593624029a8bd835f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d3f1c7f7ffdf572978468d5a3adde.png)
(3)如图2,如果H点是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbd1aaae1a60dad163311e2393c2637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42774a918f52ac8aa8b1f5b78a676f17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a576f316c84a3d20ad5dde397d5499e.png)
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解答题-证明题
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【推荐1】如图①,在
中,
求作菱形
,使点
在边
上,点
在边
上,点
在边
上.
小明的作法
如图②,在边
上取一点
,过点
作 DG∥AB 交
于点
.
以点
为圆心,
长为半径画弧,交
于点
,连接
.
在
上截取
,连接
,则四边形
为所求作的菱形.
![](https://img.xkw.com/dksih/QBM/2022/11/29/3120152842059776/3121028007485440/STEM/4f446406291141e495751337dcb6b1db.png?resizew=369)
(1)证明小明所作的四边形
是菱形.
(2)小明进一步探索,发现可作出的菱形的个数随着点
的位置变化而变化
请你继续探索,直接写出菱形的个数及对应的
的长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e602deddf45e13d85bb43622f907d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.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/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
小明的作法
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baad11467dbf6b5db5ffb1d9f15c89fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/064d746cc0e74fdc492613641fe3616c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31809cf261b1d3157f028e33d43b26d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d3d4307b9f64d8c99f864941f37874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://img.xkw.com/dksih/QBM/2022/11/29/3120152842059776/3121028007485440/STEM/4f446406291141e495751337dcb6b1db.png?resizew=369)
(1)证明小明所作的四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
(2)小明进一步探索,发现可作出的菱形的个数随着点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee7bb49247387a9028602315729f8d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】如图,在正方形
中,
,
为边
上的两个三等分点,点
关于
的对称点为
,
的延长线交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/74fad949-2f10-4a74-9baa-3bcf7fe8a6f4.png?resizew=166)
(1)求证:
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b10100be43f77a13fa0ccd1c1d72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018af6682b038cfdf6ed136943413271.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/74fad949-2f10-4a74-9baa-3bcf7fe8a6f4.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fd0d40b26dad8cee2d03ac8612b823.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cbf533b0a1151c594249106129c23a.png)
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