如图,广场上有一盏路灯距离地面10米,记灯杆的底部为A.把路灯看作一个点光源,身高1.5米的女孩站在离A点5米的点B处.回答下面的问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/1fb0505f-8e07-4d7d-aa1c-dffdad4853a6.png?resizew=176)
(1)设女孩站在B处看路灯的仰角为
,则与
最接近的角度为( )
A.
B.
C.
D.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a4c9b697e3df2b5469b71d3b5e47a2.png)
(2)若女孩以A为圆心、以5m为半径绕着灯杆走一圈,则人影扫过的图形是什么?求这个图形的面积;(结果保留1位小数)
(3)以点B为原点,直线AB为x轴(点A在x轴的正半轴上),过点B且与AB垂直的直线为y轴建立平面直角坐标系.设女孩绕灯杆行走的轨迹为M,且M上任意一点
均满足
,记点A关于点B的对称点为点C,若直线PC与曲线M相切,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/1fb0505f-8e07-4d7d-aa1c-dffdad4853a6.png?resizew=176)
(1)设女孩站在B处看路灯的仰角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a4c9b697e3df2b5469b71d3b5e47a2.png)
(2)若女孩以A为圆心、以5m为半径绕着灯杆走一圈,则人影扫过的图形是什么?求这个图形的面积;(结果保留1位小数)
(3)以点B为原点,直线AB为x轴(点A在x轴的正半轴上),过点B且与AB垂直的直线为y轴建立平面直角坐标系.设女孩绕灯杆行走的轨迹为M,且M上任意一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174914425507842b8e886022982dd2c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828ed6d211a621b44d6b49668a5a5bb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e9ac73e84745e0a1ebdbd929edcf04d.png)
更新时间:2020-11-06 23:42:17
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,已知△ABC内有一点P,满足
.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967738290831360/2969853451403264/STEM/2b259d88-b6f1-433b-865e-6e8b18d47e46.png?resizew=152)
(1)证明:
.
(2)若
,
,求PC.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cacea642a82c85058a03244a39cfeb6.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967738290831360/2969853451403264/STEM/2b259d88-b6f1-433b-865e-6e8b18d47e46.png?resizew=152)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195d57a8a45978ed4f2e7711ec9e6c71.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】在锐角三角形
中,角
的对边分别为
,向量
,
,且
.
(1)求角
的大小;
(2)若
的面积为
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034b205e3c6b2d8ab57fa0f33c9d7b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e2e90f40311961eab9d15f42f4ec123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2558ead24d56fb372fef95c10fddd3fb.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0113fd4c7d157757571f9a009e02af.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】已知
,圆C过
,
,
三点,圆心C在
(包括边界)内,求a的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88f040c4b0dcd80fde0f778d4909a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b62194097ac66a5093c57fca2f5b4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759cf42f359ab66c9b05d9ab01824466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】已知曲线
:
.
(1)当
取何值时,方程表示圆?
(2)求证:不论
为何值,曲线
必过两定点.
(3)当曲线
表示圆时,求圆面积最小时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb30ff5187ccfd4ce47225e84dcdde7.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求证:不论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)当曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知
,
,动点
满足
,活动点
的轨迹为曲线
.
![](https://img.xkw.com/dksih/QBM/2021/7/15/2764617193914368/2768792422924288/STEM/859f4784257148d4ae6e20c2f762dd35.png?resizew=230)
(1)求曲线
的方程;
(2)如图,点
是
上任意一点,过点
且与
轴垂直的直线为
,直线
与
相交于点
,直线
与
相交于点
,求证:以
为直径的圆与
轴交于定点
,并求出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b47e7bf02b3ca16f7d96b9369e51a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da927fcd8bbb7e1b32ae3575efeae306.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2021/7/15/2764617193914368/2768792422924288/STEM/859f4784257148d4ae6e20c2f762dd35.png?resizew=230)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/623afc24f2227004b0e1b3922dfb954b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,抛物线
的焦点为
,取垂直于
轴的直线于抛物线交于不同的两点
,过
作圆心为
的圆,使抛物线上其余点均在圆外,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/80a14d3c-47c6-4d51-baf0-15b0209d0414.png?resizew=352)
(1)求抛物线
和圆
的方程;
(2)过点
作倾斜角为
的直线
,且直线
与抛物线
和圆
依次交于
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ea1be9b9b6bb12afa7e1ce703d1603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5421a28dc3675ae20190d6090793246e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7677fad27034a7220e207d434cefffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7677fad27034a7220e207d434cefffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d744c48d8927b978dcb7d4ee88fdb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/80a14d3c-47c6-4d51-baf0-15b0209d0414.png?resizew=352)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ad2aae491b351640bae59209d2358ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21543d22e364aeae9e6393bea5ed943a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74916de8e7915d2b524d491353358a86.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知抛物线
的焦点为
,过点
且与
轴不垂直的直线
与抛物线交于点
,且
.
(1)求抛物线的方程;
(2)设直线
与
轴交于点
,试探究:线段
与
的长度能否相等?如果相等,求直线
的方程,如果不等,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/837ddcbaa6d5fe541fec04e9d6aee7c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a1467ecf286e3cadaf5aa006606f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65d335e66dec30244e3ee1c0d193335e.png)
(1)求抛物线的方程;
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次