如图,直角三角形OAB中,∠AOB=90°,∠A=60°∠xOA=30°,AB与y轴的交点坐标D为(0,4).求A、B的坐标.
![](https://img.xkw.com/dksih/QBM/2018/5/6/1939335947444224/1940309753888768/STEM/3b55f7a05d1541f492b91648debc2cbe.png?resizew=183)
更新时间:2018-05-07 18:33:12
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相似题推荐
解答题-作图题
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适中
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【推荐1】已知:直线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/6b51fdd5-3103-4dc4-9f71-777b978067be.png?resizew=233)
(1)求直线上横坐标是2的点A的坐标;
(2)画出直线
的图象,并根据图象写出
时,x的取值范围;
(3)求出直线上到x轴的距离等于4的点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab0906bff33675959408a1d1b6fa823.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/6b51fdd5-3103-4dc4-9f71-777b978067be.png?resizew=233)
(1)求直线上横坐标是2的点A的坐标;
(2)画出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab0906bff33675959408a1d1b6fa823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
(3)求出直线上到x轴的距离等于4的点的坐标.
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解答题-作图题
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【推荐2】如图,在平面直角坐标系中,每个方格的边长均为1个单位长度,
三个顶点的坐标分别为
、
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/6e93220d-387e-44a7-ad78-28bac769be85.png?resizew=206)
(1)请在图中画出
,使
与
关于原点中心对称,并直接写出
、
、
的坐标;
(2)将
绕原点O逆时针旋转
,画出旋转后得到的
,并直接写出
、
、
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7086e04471893c3b8e7526692286511f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f3cd3027a533dd07220f161c958602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0dca63de95a083218995d9c968d1eef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/6e93220d-387e-44a7-ad78-28bac769be85.png?resizew=206)
(1)请在图中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58cf81256c4637b099e3e00f9838d99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58cf81256c4637b099e3e00f9838d99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17dbda811facf85489abdefcd4262b7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
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解答题-问答题
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名校
【推荐1】某湿地公园修建了一条四边形
的道路,为了满足市民的需要,把
之间也修成道路.测得
,道路
,
周长是
.
(1)求道路
和
的长分别是多少?
(2)通过测量,道路
与道路
的夹角
,道路
与道路
的夹角
.小张从
处出发沿道路
以每秒
的速度跑步到
处,同时小刘也从
处出发沿道路
以每秒
的速度跑步到
处,问小张和小刘谁先到达
处?(参考数据:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0889eda2601df291b4c06507c4769c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965e0e6f43a70c5c8edce12bb5f610b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/c7bca122-67d9-4ca9-8901-4744401e9322.png?resizew=63)
(1)求道路
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e21a20c997a1adb86076fef4fb7b31e0.png)
(2)通过测量,道路
![](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/4cf16b9529102652f061bd162c8ec1db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6930edd7879bcf27c4d279dc66553893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/722b4403b1cd40188f0bfd1098ec9095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe35c9c09d1cb7c065df164ae5c62ea0.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/574cb9cf21957ecd10ca9bc36a1b0451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4259d1b43deeeeb24e628c4a13743884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721554f715d299b5e1974e58aae90897.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df276e9b9424486d59c747f1227b213c.png)
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解答题-证明题
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【推荐1】如图,AB是⊙O的直径,点C是⊙O上一点(与点A,B不重合),过点C作直线PQ,使得∠ACQ=∠ABC
(1)求证:直线PQ是⊙O的切线
(2)过点A作AD⊥PQ于点D,交⊙O于点E,若BC=OB,请判断四边形OBCE的形状并说明理由
(1)求证:直线PQ是⊙O的切线
(2)过点A作AD⊥PQ于点D,交⊙O于点E,若BC=OB,请判断四边形OBCE的形状并说明理由
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881417891356672/2886570450771968/STEM/a35312a6-6474-4083-8ff3-3e78dc8b4096.png?resizew=167)
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解答题-证明题
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【推荐2】如图,
是圆内接四边形
的对角线,
于点
平分
.
(1)求
的度数;
(2)点
在
的延长线上,
是该圆的切线.
①求证:
是该圆的切线;
②若
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ac0f2676c9b3776bfc5363d1879946.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/4306966f-16d1-482c-a3cb-9fc630890824.png?resizew=257)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44c8cb65d445ee9d5793745cba6ed9ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
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解答题-证明题
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【推荐1】如图,在
中,分别取
边上的中点D、E,连接
并延长到点F,使得
,连接
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/a29982d1-e16b-4053-9ce5-3d7db4e1b3c6.png?resizew=145)
(1)求证:四边形
是菱形;
(2)若
,则四边形
的面积为___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78f0dc06c224ca63d9267c1a550004d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69995843d21aed8728363afe2fbb6462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/a29982d1-e16b-4053-9ce5-3d7db4e1b3c6.png?resizew=145)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85dc333ecb4f9b197d2aeef5c4d07089.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
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解答题-问答题
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【推荐2】某学校内有一块如图所示的三角形空地
,其中
米,
米,
米,计划将这块空地建成一个花园,以美化校园环境,预计花园每平方米造价为
元,则学校修建这个花园需要投资多少元?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26d451d3fd83f2336d421c32ecaadfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4228e67b37358f16e793e4499c7472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbeb1c517ed4057debba4b9ba5397b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f959e5f8d89390f0f136f6acc9f6fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/5266b8b9-2ba3-4579-9ed5-5ca8ea146409.png?resizew=109)
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解答题-计算题
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【推荐3】阅读与思考
两点之间的距离公式
如果数轴上的点
,
分别表示实数
,
,两点
,
间的距离记作
,那么
.
对于平面上的两点
,
间的距离是否有类似的结论呢?
运用勾股定理,就可以推出平面上两点之间的距离公式.
(1)如图,平面上两点
,
,求A,B两点之间的距离
?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/19d8f92b-5d48-49ef-8c10-6372f1f03fa8.png?resizew=143)
(2)如图,平面上两点
,
,求这两点之间的距离
?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/59f34680-433c-4bc9-9014-9a86c2529a3d.png?resizew=195)
(3)一般地,设平面上任意两点
和
,如图,如何计算A,B两点之间的距离
?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/fc1efb2c-e4c1-4194-b7a0-f2bd501c29df.png?resizew=209)
对于问题3,作
轴,
轴,垂足分别为点
,
;作
轴,垂足为
;作
,垂足为点C,且延长BC与y轴交于点
,则四边形
,
是长方形.
∵
,
,
∴
.
∴
.
这就是平面直角坐标系中两点之间的距离公式.
(4)思考求下列两点之间的距离:
,
;
两点之间的距离公式
如果数轴上的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b8b482d386a4864468447e30bc5d612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/531dca79bfb8a1178752f5783a2311a9.png)
对于平面上的两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
运用勾股定理,就可以推出平面上两点之间的距离公式.
(1)如图,平面上两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241ce9bd28046ce9b90f43b391132884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d429efe96d68065e7d433c996682791d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/19d8f92b-5d48-49ef-8c10-6372f1f03fa8.png?resizew=143)
(2)如图,平面上两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115a0c87ac14dbb770c95d74d6e26073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5f2bba8303c05689ef4538e98e8929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/59f34680-433c-4bc9-9014-9a86c2529a3d.png?resizew=195)
(3)一般地,设平面上任意两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/fc1efb2c-e4c1-4194-b7a0-f2bd501c29df.png?resizew=209)
对于问题3,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d45aea2e4ab6e10253342f1888092e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238c454e2b2d1ee928f225fe36713d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d7ffb7889a31b267a85f1ea238138e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5d54dfb9237412a7c1c00658830de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb48b6bb676e914d896c8c788529142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fabb0b90b8d893f10ad6af0ed6018b09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719740edfeb39be0370619ca065653c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81237d48907b43ef05365753fd081c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55706bd1fd19eff34ed695a156c5ee5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0787ff9a6f6d3f0c9c6d86886b2328ce.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684dd4b99264732bdd6e46af62eb023a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e92a479719b05cc78a3889d0882ffa.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11588fb5a6b6977c42b95f99d9efc8cc.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c91e1757e732b7a4b148a94b5f2466b.png)
这就是平面直角坐标系中两点之间的距离公式.
(4)思考求下列两点之间的距离:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9c730266ecf448c14608e24d37b986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a397b31b1482eb6c43e41acb7cff38.png)
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