如图,在四边形
中,
,
,
为对角线
的中点,
为边
的中点,连接
,
.
(1)求证:四边形
为菱形;
(2)连接
交
于
,若
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f779e7f5f53e4377b9a0a8e945d562.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/11/837beb84-d9da-4d14-8639-a60e5844e66b.png?resizew=173)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eeb94acdc3de00655e6e29d5372da09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
更新时间:2023-10-10 12:42:12
|
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【推荐1】如图,在Rt△ABC中,∠ACB=90°,AB=10cm,AC=6cm,动点P从点B出发沿射线BC以1cm/s的速度移动,设运动的时间为t秒,当△ABP为等腰三角形时,求t的取值?
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【推荐2】如图,在△ABC中,∠B=90°,AB=4,BC=8.
(1)在BC上求作一点P,使PA+PB=BC;(尺规作图,不写作法,保留作图痕迹)
(2)求BP的长.
(1)在BC上求作一点P,使PA+PB=BC;(尺规作图,不写作法,保留作图痕迹)
(2)求BP的长.
![](https://img.xkw.com/dksih/QBM/2019/6/20/2229573279891456/2230512693755904/STEM/90c92d06c3e74d9aa6956dcca53db7fe.png?resizew=160)
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【推荐3】在平面直角坐标系中,长方形OABC的边OA在x轴上,OC在y轴上,B(4,3),点M从点A开始,以每秒1个单位长度的速度沿AB→BC→CO运动,设△AOM的面积为S,点M运动的时间为t.
(1)当0<t<3时,AM= ;当7<t<10时,OM= .(用含t的代数式表示)
(2)当7<t<10时,求S关于t的函数关系式;
(3)当t=8时,在x轴上是否存在一点H,使得△MBH是以MB为直角边的直角三角形,若存在,请求出点H的坐标;若不存在,请说明理由.
(1)当0<t<3时,AM= ;当7<t<10时,OM= .(用含t的代数式表示)
(2)当7<t<10时,求S关于t的函数关系式;
(3)当t=8时,在x轴上是否存在一点H,使得△MBH是以MB为直角边的直角三角形,若存在,请求出点H的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853002528440320/2863168502939648/STEM/d59d2980-955f-4fbf-9736-4b41554ac46b.png?resizew=275)
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【推荐1】如图,在四边形ABCD中,点E、F、G、H分别是边AB、BC、CD、DA的中点,连接EF、FG、GH、EH.
(1)求证:四边形EFGH是平行四边形;
(2)再加上条件 后,能使得四边形EFGH是矩形.请从①四边形ABCD是菱形,②四边形ABCD是矩形这两个条件中选择1个条件填空(写序号),重新画图并写出证明过程.
(1)求证:四边形EFGH是平行四边形;
(2)再加上条件 后,能使得四边形EFGH是矩形.请从①四边形ABCD是菱形,②四边形ABCD是矩形这两个条件中选择1个条件填空(写序号),重新画图并写出证明过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/66250f8a-1693-4ec3-b5c0-185543d62dab.png?resizew=191)
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【推荐2】如图,以
的边
为直径作
,交
于点D,D为
的中点,过点D作
,垂足为E.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712443622391808/2725962290077696/STEM/3980b8d9841242829b469fff0aa3946d.png?resizew=183)
(1)证明:
是
的切线.
(2)若
的半径为5,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712443622391808/2725962290077696/STEM/3980b8d9841242829b469fff0aa3946d.png?resizew=183)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a2c0fa960a7a343096bdb66bb11285b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐1】如图,平行四边形
中,
与
相交于点O,点P为
中点,
交
于点E,连接
,
.
(1)求证:平行四边形
为菱形;
(2)若
,
,
①求
的值.
②求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553a93e0b6156befa00b50bdfaef95d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/31/f3f95928-b727-4997-80b2-220c4787efd6.png?resizew=178)
(1)求证:平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb30af9824937fdd6b1165308f3521b.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】已知:
的两条高
交于点
,点
分别是
,
的中点,连接
.
![](https://img.xkw.com/dksih/QBM/2020/4/24/2448428442746880/2449157631434752/STEM/e69fe15a94fb4d019dba953414d05d89.png?resizew=170)
(1)求证:
垂直平分
;
(2)若
.判断以
为顶点的四边形的形状,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e5ba3badffe942dcfb60da88629e7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692c58a2af64d705cd4a988ed2bfbc3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c966e975f8eee198496410173a94a381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4737ccd7f6ee7412b9757cf72daf1dbb.png)
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解答题-作图题
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【推荐1】如图,
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/c8081d86-44c9-44ee-8f4a-8f224e1c356a.png?resizew=144)
(1)仅用圆规在平面内找一点D(异于点A),使得点D到射线AB、AC的距离相等,且
;(不写作法,保留作图痕迹)
(2)求四边形ABDC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/c8081d86-44c9-44ee-8f4a-8f224e1c356a.png?resizew=144)
(1)仅用圆规在平面内找一点D(异于点A),使得点D到射线AB、AC的距离相等,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec577daa119b13413aafbd667f8922be.png)
(2)求四边形ABDC的面积.
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【推荐2】在矩形
中,两条对角线
相交于点O,C作
,且
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/e239d30a-e0b5-4e89-919b-79715df4333b.png?resizew=216)
(1)判断四边形
的形状,并说明理由;
(2)若
,求四边形
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/ea592fbf7b081422023b8fd725f0129b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d04bad705fd405ef485bcdb014b9375c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/e239d30a-e0b5-4e89-919b-79715df4333b.png?resizew=216)
(1)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ff841d876a4574ca1fce9433410e01.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17725f07bbe525b8b9b8aa035e045015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ff841d876a4574ca1fce9433410e01.png)
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