如图,在矩形ABCD中,对角线AC与BD相交于点O,AE⊥BD,垂足为E,BE=2,DE=6,求AD的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/261f1280-02a2-4af9-802b-bbb4f9b36b23.png?resizew=176)
21-22八年级下·江苏淮安·期中 查看更多[2]
江苏省淮安市淮安区2021-2022学年八年级下学期期中数学试题(已下线)专题03 菱形、正方形、三角形的中位线【知识梳理+专项训练】-2022-2023学年八年级数学下学期期中期末考点大串讲(苏科版)
更新时间:2022-08-18 08:33:41
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【推荐1】如图,在△ABC中,D是BC的中点,DE⊥BC交AB于点E,且BE2﹣EA2=AC2.
(1)求证:∠A=90°;
(2)若AC=6,BD=5,求△AEC的周长.
(1)求证:∠A=90°;
(2)若AC=6,BD=5,求△AEC的周长.
![](https://img.xkw.com/dksih/QBM/2021/10/25/2836737817903104/2841852570279936/STEM/e9ebde4e-5e59-4cf8-abaa-fc76b9c6f3d1.png?resizew=280)
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【推荐2】如图,在
中,请用尺规作图法在
边上找一点
,连接
,使得
.(保留作图痕迹,不写作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/a00e5b98-a102-42b2-979d-03ac124de996.png?resizew=184)
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【推荐1】如图是一款圣诞帽,该帽子的下方是正六边形
,延长
、
交于点
,判断帽子的顶部
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10cb69a0c4d999668181d8d64c0fbdd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/9df57c75-8475-4358-b936-f0af05157516.png?resizew=126)
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【推荐2】如图,四边形
内接于
,连接
,
,
.
(1)求
的大小;
(2)若
的半径为3,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4872f0c07434280ba24cbdf250d90ccb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/27a1857c-7007-42cd-8ae9-5c4f98159a13.png?resizew=91)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
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【推荐1】如图,在
中,D是边
上一点,以
为直径的
经过点A,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/2082ead1-d98e-40e9-a310-6a84d8562db1.png?resizew=161)
(1)请判断直线
是否是
的切线,并说明理由.
(2)若
,
,求
的直径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc3fb27803d7ee3d3a97781858f7d37.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/2082ead1-d98e-40e9-a310-6a84d8562db1.png?resizew=161)
(1)请判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae15e5357601ddb7e303b56dbe337145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,
直径,C为
上一点,
和过C点的直线互相垂直,垂足为D点,且
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/4bf85f72-8e84-4481-9525-2143eb2efe92.png?resizew=123)
(1)求证:
为
的切线;
(2)若
,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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/4bf85f72-8e84-4481-9525-2143eb2efe92.png?resizew=123)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246f1e6785715757c34c10a90233e640.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-问答题
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【推荐1】如图,在长方形OABC中,O为平面直角坐标系的原点,点A坐标为
,点C的坐标为
,且a、b满足
,点B在第一象限内,点P从原点出发,以每秒2个单位长度的速度沿着O—C—B—A—O的线路移动.
(1)求a,b的值,点B的坐标;
(2)当点P移动4.5秒时,请指出点P的位置,并求出点P的坐标;
(3)在O—C—B段的移动过程中,当△OPB的面积是12时,求点P移动的时间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf75310b48015af5b03e8b4ea7a16ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad29801f799532ee7dda9658c30e373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac7200c2039a94082022ba4d47109e8.png)
(1)求a,b的值,点B的坐标;
(2)当点P移动4.5秒时,请指出点P的位置,并求出点P的坐标;
(3)在O—C—B段的移动过程中,当△OPB的面积是12时,求点P移动的时间.
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853326533910528/2863166810431488/STEM/3088a183-19f2-4ba6-ad9a-704516f70c54.png)
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【推荐2】如图已知:矩形ABCD,对角线AC、BD相交于点O.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987925720940544/2992081991106560/STEM/77ac2e49a1b44f0db6ca74909f03e13d.png?resizew=168)
(1)利用图中的向量表示:
+
=______;
(2)利用图中的向量表示:
=______;
(3)如果|
|=5,|
|=5,求|
|的值.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987925720940544/2992081991106560/STEM/77ac2e49a1b44f0db6ca74909f03e13d.png?resizew=168)
(1)利用图中的向量表示:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1da92a2fc2ce861e82f7192fe4e648f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a1a69d7460d12d4facd43e0d941190.png)
(2)利用图中的向量表示:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b33d1cb5d5544977e00ba583ae8617.png)
(3)如果|
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fe2d802f2b37e7db198c5a3c1df9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1da92a2fc2ce861e82f7192fe4e648f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e806a09026955ac39efb022ad37027.png)
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