有这样一道作图题:“求作一个平行四边形
,使得点A与边
的中点E的连线平分
.”
小明的思考过程是这样的:在不明确如何入手的时候,可以先把图描出来,接着倒过来想它有什么性质.
即为所求作,则
,
∴
.
又
平分
,
∴
.
∴
,
∴
.
∵E是边
的中点,
∴……
再倒过来,只要作出的平行四边形
满足
和
的数量关系是①即可.
(1)填空:①______.
(2)参考小明的思考方式,用直尺和圆规作一个
,使得点A与边
的中点E的连线与对角线
垂直.(要求:只保留作图痕迹,无需写出文字说明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
小明的思考过程是这样的:在不明确如何入手的时候,可以先把图描出来,接着倒过来想它有什么性质.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54efc4116b6cb296d55892a21e0d797f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b0d91bc0df1803d79fe69634b0f387.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b99cc59d96cd5bd2fd903a5f0d09da.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c7c64e42ae152917a90e11663ea3c6c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bae74865b97db7ced7fbf67303668ee.png)
∵E是边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
∴……
再倒过来,只要作出的平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
(1)填空:①______.
(2)参考小明的思考方式,用直尺和圆规作一个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54efc4116b6cb296d55892a21e0d797f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
更新时间:2023-05-16 08:38:11
|
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解答题-作图题
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适中
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【推荐1】作图题
(1)如图,两条公路OA和OB相交于O点,在∠AOB的内部有工厂C和D,现要修建一个货站P,使货站P到两条公路OA、OB的距离相等,且到两工厂C、D的距离相等,用尺规作出货站P的位置.(要求:不写作法,保留作图痕迹,写出结论)
![](https://img.xkw.com/dksih/QBM/2018/11/20/2079493114650624/2082917570306048/STEM/e7e4036fb0cb4a30a349543226eff989.png?resizew=166)
(2)如图,有两个点A、B和直线CD.在直线CD上找一点P,使△ABP周长最小.
(1)如图,两条公路OA和OB相交于O点,在∠AOB的内部有工厂C和D,现要修建一个货站P,使货站P到两条公路OA、OB的距离相等,且到两工厂C、D的距离相等,用尺规作出货站P的位置.(要求:不写作法,保留作图痕迹,写出结论)
![](https://img.xkw.com/dksih/QBM/2018/11/20/2079493114650624/2082917570306048/STEM/e7e4036fb0cb4a30a349543226eff989.png?resizew=166)
(2)如图,有两个点A、B和直线CD.在直线CD上找一点P,使△ABP周长最小.
![](https://img.xkw.com/dksih/QBM/2018/11/20/2079493114650624/2082917570306048/STEM/6033be2e011e4f28a631855b12434d48.png?resizew=211)
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解答题-作图题
|
适中
(0.65)
【推荐2】如图,四边形
为矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/28ab8522-6289-4920-961e-8bd39f79f44a.png?resizew=160)
(1)求作
边的中点E(用尺规作图法,保留作图痕迹,不要求写作法)
(2)连接
、
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/28ab8522-6289-4920-961e-8bd39f79f44a.png?resizew=160)
(1)求作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb1d2e0c345ca12c20c15ccf169862b.png)
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解答题-证明题
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适中
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【推荐1】如图,平行四边形
的对角线
相交于点
,点
在对角线
上,且
,连接
.
是平行四边形.
(2)若
的面积等于
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/072db141bb8d926abde907abd0309de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1614aca06dc4ef4902b7a3db1aaaba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684f55970df210065eaa81b898bfdb9d.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】已知:如图,
是
的角平分线,点E、F分别在
上,且
,
.
![](https://img.xkw.com/dksih/QBM/2023/4/7/3211495308484608/3212231118503936/STEM/d5eee9ef363d452ebea7d42b230791ee.png?resizew=184)
(1)求证:
;
(2)若
的周长为3,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd3724385f98a2415ba27f8df4c31d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14dbafa1565aa5fb728b1b6edc1f8a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fedf634c305704c1c13cb0353d5dc7c5.png)
![](https://img.xkw.com/dksih/QBM/2023/4/7/3211495308484608/3212231118503936/STEM/d5eee9ef363d452ebea7d42b230791ee.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699d8346239a5558cc53911f181a270c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,
的为
的直径,M为
外一点,连接
,分别交
于点C、D,且D为
的中点,连接
,过点B作
的切线,交
的延长线于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/6c252bc9-e43e-4cab-aa04-c6c7baec71fb.png?resizew=145)
(1)求证:
;
(2)连接
,若
的半径为6,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20c883bc7c4f49ce4a1a1a6e5d674e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/6c252bc9-e43e-4cab-aa04-c6c7baec71fb.png?resizew=145)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b96d03e996f4a7fc4a3a2f315795f8.png)
(2)连接
![](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/14665eacba3615f5be1c943ac69faf96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,
是
的直径,点C、D在
上,且
平分
,过点D作
的垂线,与
的延长线相交于E,与
的延长线相交于点F,G为
的下半圆弧的中点,
交
于H,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/1/49bbd9c0-4b5c-45c6-9e2f-bea7661672b9.png?resizew=149)
(1)证明:
是
的切线;
(2)若圆的半径
,
,求
的长;
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/1/49bbd9c0-4b5c-45c6-9e2f-bea7661672b9.png?resizew=149)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若圆的半径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1f8a491451335dc331dcdd4a745f60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fe49abfd436a012126ca65b63be66c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e2c03bec1757f50c97b0efd9cf415bc.png)
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