【教材呈现】下图是华师版数学教材八年级下册第
页的部分内容
请根据教材分析,结合图
,写出完整的证明过程
证明 【结论应用】如图
,直线
分别交矩形
的边
于点
,将矩形
沿
翻折,使点
与点
重合,点
落到点
处,若
,
,则矩形
的面积为________.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/e04d7fd8-807c-468b-a75b-15d57fdefbc6.png?resizew=448)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c2ec887d7dd700df4dc1634d09865be.png)
例![]() ![]() ![]() ![]() ![]() ![]() ![]() 分析 要证四边形 ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
证明 【结论应用】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba48366317ebea1c9dd5e4e67e03092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21d8e7af78693e5da7957c8034e8bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a21f10cb259b56414494eb209d767f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/e04d7fd8-807c-468b-a75b-15d57fdefbc6.png?resizew=448)
图① 图②
更新时间:2024-01-15 13:45:22
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】按逻辑填写步骤和理由,将下面的求解过程补充完整
如图,在直角
中,
,
的垂直平分线
分别交
、
于点
、
.若
,求
的度数.
解:设
,
∵
(已知)
∴
,
∴
,
∵
是
的垂直平分线(已知)
∴
,
∴
是等腰三角形,
∴
,
∵
是直角三角形,
(已知)
∴
,
∴
,
∴
,
∴
.
如图,在直角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10122956e575cc1901aed4f95ae46af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/25/230b69c5-8918-48d2-9c96-cff347ac9517.png?resizew=189)
解:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dc4b2eb25492442ee2483244707100.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10122956e575cc1901aed4f95ae46af.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f55567f40f9e70d38e75180b96d5c02.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6601e38fb0b2f86cb8f511ed68824eea.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7feef87c97743322569fa8f85e4f485e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfcefb47a080c7f92a7d4cf9e1b251ac.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1e15dfb2df7d976ba95a448b025ebe.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5cb611690061168d64b863d128ad37.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d6279939b764fab41641cb2eef7e614.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87058c72a5742f855d2fc1b96deeb0d2.png)
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名校
【推荐2】如图,在□ABCD中,EF是对角线AC的垂直平分线,分别与AD,BC交于点E,F.
![](https://img.xkw.com/dksih/QBM/2021/8/8/2781529950642176/2781969188970496/STEM/8d57cebd-f914-45f7-9947-9c1d13a76cdb.png)
(1)求证:四边形AECF是菱形;
(2)若AC=6,AE=5,求菱形AECF的面积.
![](https://img.xkw.com/dksih/QBM/2021/8/8/2781529950642176/2781969188970496/STEM/8d57cebd-f914-45f7-9947-9c1d13a76cdb.png)
(1)求证:四边形AECF是菱形;
(2)若AC=6,AE=5,求菱形AECF的面积.
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【推荐1】如图,
,
平分
,且交
于点
,
平分
,且交
于点
,连接
.
是菱形;
(2)若
,
,过点
作
于点
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf7dc43a39738e3e2a0b819be505c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71e6ea7333dbc78d0a7b9bc3892f940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c65dd20af94247cb634911e7e215fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
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【推荐2】上杭县紫金中学校园内未名湖中央有一座石拱桥,桥体呈抛物线形状,桥孔呈圆弧型,共同组成一个漂亮的轴对称图形.为进一步了解桥体,小明和小张同学带着一把皮尺和一根一端系着铅块的绳子(铅锤绳)来到石拱桥.首先他们利用皮尺测量了石拱桥点水平宽度(
米),然后来到石拱桥最顶端O处,把铅锤绳的一端放在O处,含铅的一端自然下垂,经过调整让铅块落在直线
上的C点处(此时
),做好标记测量得到
米,用同样的方法测得
米.圆弧与
交于M、N两点,在N点处测得
米(此时
垂直
).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/7ba1ed00-3559-4b79-b2b5-c9d657b04bee.png?resizew=564)
根据以上数据,请你帮助他们处理下列问题:
(1)根据图形,建立恰当的平面直角坐标系,求出抛物线解析式;
(2)根据数据,请判断圆弧
是否为半圆?说明理由;
(3)请求出圆弧
所在圆的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/771b610e4ddefa739a985d1e5462ce5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f261c626ea7e8d1d300a5d8b62be759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59facca1bd25fd5df19ed20dd0506e5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ee35c09d1eb12db2846d1b15f455f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/7ba1ed00-3559-4b79-b2b5-c9d657b04bee.png?resizew=564)
根据以上数据,请你帮助他们处理下列问题:
(1)根据图形,建立恰当的平面直角坐标系,求出抛物线解析式;
(2)根据数据,请判断圆弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8cca4f1e9b918c89399a2a0024a60f.png)
(3)请求出圆弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8cca4f1e9b918c89399a2a0024a60f.png)
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【推荐1】如图,在矩形ABCD中,AD>AB,点E是AD边上的一个动点,将四边形 BCDE沿直线BE折叠,得到四边形BPFE,点C、D的对应点分别为点P、F. 直线DA交BP于点H.
![](https://img.xkw.com/dksih/QBM/2020/7/24/2512836619485184/2513638883172352/STEM/ccbddc71-bb9c-4d0c-bdeb-e51767624b86.png)
(1)求证:EH=BH;
(2)连接FH,已知AB=2.
①图①,当AD=6,AE=
AD时,求FH的长度;
②图②,当四边形BEFH为菱形时,请直接写出AD的长度.
![](https://img.xkw.com/dksih/QBM/2020/7/24/2512836619485184/2513638883172352/STEM/ccbddc71-bb9c-4d0c-bdeb-e51767624b86.png)
(1)求证:EH=BH;
(2)连接FH,已知AB=2.
①图①,当AD=6,AE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
②图②,当四边形BEFH为菱形时,请直接写出AD的长度.
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【推荐2】将一个矩形纸片OABC放置在平面直角坐标系中,点O(0,0),点A(3,0),点C(0,6),点P在矩形的边OC上,折叠该纸片,使折痕所在的直线经过点P,并与x轴的正半轴相交于点Q,且
,点O的对应点
落在第一象限.设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/5703acad-0a5b-468e-9138-656bbe8eedfe.png?resizew=206)
(1)如图①,当
时,求
的大小和点
的坐标;
(2)当点
恰好落在AB边上时,求重合部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3700e0f814a450b0a52e453640df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/154ae60c4f7b51fccaaeb7d52c6f4ef7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/5703acad-0a5b-468e-9138-656bbe8eedfe.png?resizew=206)
(1)如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83df0599326b75fad20d84a70da4fdb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
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【推荐1】如图,在平行四边形
中,
,
相交于点
,点
,
在
上,且
.连接
,
.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d96d1615aadc8f185baff25dfd3e58.png)
(2)
满足什么条件,连接
,
时,四边形
是菱形,(不需要说明理由).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d96d1615aadc8f185baff25dfd3e58.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e41003131c669f518bc8485620486fa.png)
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【推荐2】如图,在
中,
,
,
,
垂直平分
,垂足为
,交
于点
,点
在
的延长线上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/c5718d9a-6653-44e9-a786-42d59fbec72b.png?resizew=186)
问题解决:(1)
的值等于______.
求证:(2)
;
(3)四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c28be5dccf0a867ad905c3124d45277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/f52a58fbaf4fea03567e88a9f0f6e37e.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/f7c581dab991aeadf06d972e47673ea8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/c5718d9a-6653-44e9-a786-42d59fbec72b.png?resizew=186)
问题解决:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
求证:(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
(3)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
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