在某张航海图上,标明了三个观测点的坐标为
、
、
,由三个观测点确定的圆形区域是“利剑
”中国多军种军事演习区,如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/83f28cb7-6fe8-4667-aa16-0c0943b116cf.png?resizew=164)
(1)求圆形区域的面积.
(2)某时刻海面上出现一艘可疑船
,在观测点
测得
位于北偏东
方向上,同时在观测点
测得
位于北偏东
方向上,求观测点
到可疑船
的距离,结果保留根号;
(3)当可疑船
由(2)中的位置向正西方向航行时,是否会进入演习区?请通过计算解释.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02033bcaf7a59f4fa1969a740c87718d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542798f7cf749016772b4c2ed4ae7ef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a69fba60510802da21a680aefd1eda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b360d9695221d9dbf59474bd50e8b1e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/83f28cb7-6fe8-4667-aa16-0c0943b116cf.png?resizew=164)
(1)求圆形区域的面积.
(2)某时刻海面上出现一艘可疑船
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(3)当可疑船
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
2023·安徽滁州·一模 查看更多[2]
更新时间:2023-03-20 21:31:38
|
相似题推荐
解答题-作图题
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【推荐1】如图,在平面直角坐标系中,已知△ABC中的三个顶点都落在小正方形的顶点处.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/521fa89d-aa68-454a-a79b-61c4ec8f8ba8.png?resizew=170)
(1)画出与△ABC关于y轴对称的图形△A1B1C1;
(2)点A1的坐标为 ;
(3)在x轴上找一个点P,使PB+PC最小(不写作法,保留作图痕迹).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/521fa89d-aa68-454a-a79b-61c4ec8f8ba8.png?resizew=170)
(1)画出与△ABC关于y轴对称的图形△A1B1C1;
(2)点A1的坐标为 ;
(3)在x轴上找一个点P,使PB+PC最小(不写作法,保留作图痕迹).
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真题
名校
【推荐2】如图,在平面直角坐标系
中,点
,点
.
(1)尺规作图:在第一象限内求作一个点
,使点
同时满足下列两个条件(要求保留作图痕迹,不必写出作法);
①点
到A,
两点的距离相等;
②点
到两坐标轴的距离相等.
(2)在(1)作出点
后,则点
的坐标为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4eea0c005a2c751eae7435686b588da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ec12932f9491d271953f3fc34a5cd47.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/b6058aa9-5b48-4d70-9cbd-8730831fe0ec.png?resizew=152)
(1)尺规作图:在第一象限内求作一个点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)在(1)作出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-证明题
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【推荐1】矩形ABCD中,E为AB边上的中点, AF⊥DE,交AF于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/555dcbf9-38ab-40b4-96d1-98172e352246.png?resizew=182)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/085500ef-d853-4871-9921-651ee504acf0.png?resizew=181)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/da3e1b50-1e6a-4bcb-a29b-137eec9ec604.png?resizew=156)
(1)若矩形ABCD是正方形,
①如图1,求证:△ADG∽△EAG;
②如图2,分别连接BG和BD,设BD与AF交于点H.求证:BG2=AG·DG;
(2)类比:如图3,在矩形ABCD中,若
, BG=5,求AG的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/555dcbf9-38ab-40b4-96d1-98172e352246.png?resizew=182)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/085500ef-d853-4871-9921-651ee504acf0.png?resizew=181)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/da3e1b50-1e6a-4bcb-a29b-137eec9ec604.png?resizew=156)
(1)若矩形ABCD是正方形,
①如图1,求证:△ADG∽△EAG;
②如图2,分别连接BG和BD,设BD与AF交于点H.求证:BG2=AG·DG;
(2)类比:如图3,在矩形ABCD中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1839daef282c467699c4a3ea92ee5f67.png)
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【推荐2】【问题思考】如图1,等腰直角
,
,点O为斜边
中点,点D是
边上一点(不与B重合),将射线
绕点O逆时针旋转
交
于点E.学习小组发现,不论点D在
边上如何运动,
始终成立.请你证明这个结论;
【问题迁移】
如图2,
,
,
,点O为斜边
中点,点E是
延长线上一点,将线段
绕点O逆时针旋转
得到
,点D恰好落
的延长线上,求
的值;
【问题拓展】
如图3,等腰
中,
,
,点D是
边上一点,将
绕点C顺时针旋转
得到
,点D落在点E处,连接
,
,取
的中点M,连接
,若
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.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/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/28/4cf47474-36a2-422d-b0a0-cbcbbe5f3564.png?resizew=575)
【问题迁移】
如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cdc5c5356ec37800b9e71ee1ad5cca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60e35a4368a93ffde747d30fa73d8a56.png)
【问题拓展】
如图3,等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f45435a906987577a018943fbad1278b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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【推荐3】如图1是著名的赵爽弦图,由四个全等的直角三角形拼成,用它可以证明勾股定理,思路是大正方形的面积有两种求法,一种是等于c2,另一种是等于四个直角三角形与一个小正方形的面积之和,即
ab×4+(b-a)2,从而得到等式c2=
ab×4+(b-a)2,化简便得结论a2+b2=c2.这里用两种求法来表示同一个量从而得到等式或方程的方法,我们称之为“双求法”.现在,请你用“双求法”解决下面两个问题:
(2)如图3,在△ABC中,AD是BC边上的高,AB=4,AC=5,BC=6,设BD=x,求x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)如图3,在△ABC中,AD是BC边上的高,AB=4,AC=5,BC=6,设BD=x,求x的值.
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解答题-作图题
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【推荐1】(1)作Rt△ABC的外接圆⊙O(不写作法,保留作图痕迹)
(2)Rt△ABC中,若∠C=90°,BC=8,AC=6.求:⊙O的面积.
(2)Rt△ABC中,若∠C=90°,BC=8,AC=6.求:⊙O的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/64c8198a-4ab2-4a31-a968-4da42f7655dc.png?resizew=151)
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解答题-证明题
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【推荐2】如图,四边形
的对角线相交于点
,
,
,过点
,点
分别作
,
,垂足分别为点
、
.
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958241553448960/2961637694201856/STEM/6799cb8c-d964-4b1a-989d-6d48d92e97ab.png?resizew=211)
(1)求证:
①
;
②
;
(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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3f843b83e62bab294988a7ea134a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f22a601861b2d7c266c307e4ae05784.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958241553448960/2961637694201856/STEM/6799cb8c-d964-4b1a-989d-6d48d92e97ab.png?resizew=211)
(1)求证:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca61f08915e5bd5d9581cb90894e2d0.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049ba02a6816033ade98e679a59a3b24.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40987ecda9124c03d9b2ae95dac2dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30a8b77a3ffe52f2c6dcf05f3f95947a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-应用题
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【推荐1】如图,灯塔C位于灯塔B的正东方向,两灯塔相距
,灯塔B位于港口A的北偏东
方向,距离港口A
,一艘轮船从港口A出发,沿正南方向航行到D处,测得灯塔C位于北偏东
方向上,这时,D处距离灯塔C有多远?(结果取整数)(参考数据:
,
,
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3fb33e7fb8709bd8d5db686644d50b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/652ad8228655ba81496fc44341397415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f971d44effe601c7244f7bcde43b863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6f107b79080fa968334b16fec1dd4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7864a6305afcb39d3a47542e1f3ad094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eec6678f15b160728fa117cce893c58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c25ef3d632398a931a390b501051757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0494dafbea4df1d95c758ddb656afa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78bccacbdde830e1329412e3e8f42ea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0062f4f00732a0cf11d1ac145c218b.png)
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【推荐2】4月重庆市巴南区某景区红枫烂漫,迎来大量游客观赏,为了落实防疫要求,景区计划在西门A和东门B之间修建一条笔直的专用通道
(其中B在A的正东方向上).已知通道
的一侧有一个半径为800米的圆形湖泊,湖泊正中央是多彩喷泉C,在通道
上的有个观景台M,经测得喷泉C在观景台M的北偏东
方向上,从观景台M向东走300米到达凉亭N处,此时测得喷泉C正好在凉亭N的东北方向上.(参考数据:
)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/22230c93-6c01-4fbc-aef4-0e824abbd361.png?resizew=277)
(1)求观景台M与多彩喷泉C之间的距离是多少米?
(2)为了不破坏湖泊,修建的通道
是否需要改变线路?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/903c1bb6f9fe8f9b9710683a3e601452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526903588a442b8babf8c6a4b9d88f63.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/22230c93-6c01-4fbc-aef4-0e824abbd361.png?resizew=277)
(1)求观景台M与多彩喷泉C之间的距离是多少米?
(2)为了不破坏湖泊,修建的通道
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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