1 . 在
中,
,
,以点
为圆心、
为半径作圆,设点
为⊙
上一点,线段
绕着点
顺时针旋转
,得到线段
,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/0824be7f-8d3b-4817-83b0-73740289a84f.png?resizew=414)
(1)在图中,补全图形,并证明
.
(2)连接
,若
与⊙
相切,则
的度数为 .
(3)连接
,则
的最小值为 ;
的最大值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19bc7774144c164f7ebaeca54fa657e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ff7caec4fdd8fb54a3ffbff9692414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/0824be7f-8d3b-4817-83b0-73740289a84f.png?resizew=414)
(1)在图中,补全图形,并证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c30fad9d4f86033bcd8375ddd6d3874.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7890f747854b8fcf25dcff1991fb84.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
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2 . 我们知道,圆可以看成到定点的距离等于定长的点的集合.我们又知道了在平面内点与圆有三种位置关系.如图1,点P在⊙O外,点A是⊙O上一个动点,连接PO交⊙O于点B,我们发现,当点A与点B重合时,线段PA长最短.
![](https://img.xkw.com/dksih/QBM/2020/12/9/2610570883284992/2611163851587584/STEM/d90516004d5444b1b8858de16d486285.png?resizew=491)
(1)利用图1 ,说明PA>PB;
(2)如图2,一架10米长的梯子沿墙壁下滑,一只距离墙壁12米,距离地面5米的小鸟看到梯子的中点位置有食物,小鸟想用最短时间吃到食物,请在图中画出小鸟飞行的路径,并计算出小鸟飞行的距离;
(3)如图3,矩形ABCD中,AB=2,AD=3,点E、F分别为AD、DC边上的点,且EF=2,点G为EF的中点,点P为BC上一动点,直接写出PA+PG的最小值.
![](https://img.xkw.com/dksih/QBM/2020/12/9/2610570883284992/2611163851587584/STEM/d90516004d5444b1b8858de16d486285.png?resizew=491)
(1)利用图1 ,说明PA>PB;
(2)如图2,一架10米长的梯子沿墙壁下滑,一只距离墙壁12米,距离地面5米的小鸟看到梯子的中点位置有食物,小鸟想用最短时间吃到食物,请在图中画出小鸟飞行的路径,并计算出小鸟飞行的距离;
(3)如图3,矩形ABCD中,AB=2,AD=3,点E、F分别为AD、DC边上的点,且EF=2,点G为EF的中点,点P为BC上一动点,直接写出PA+PG的最小值.
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3 . 我们给出如下定义:两个图形
和
,在
上的任意一点
引出两条垂直的射线与
相交于点
、
,如果
,我们就称
、
为点
的垂等点,
、
为点
的垂等线段,点
为垂等射点.
(1)如图1,在平面直角坐标系
中,点
为
轴上的垂等射点,过
作
轴的平行线
,则直线
上的
为点
的垂等点的是_______;
(2)如果一次函数图象过
,点
为垂等射点
的一个垂等点且另一个垂等点
也在此一次函数图象上,在图2中画出示意图并写出一次函数表达式;
(3)如图3,以点
为圆心,1为半径作
,垂等射点
在
上,垂等点在经过(3,0),(0,3)的直线上,如果关于点
的垂等线段始终存在,求垂等线段
长的取值范围(画出图形直接写出答案即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acd79bb9fb06f7c806eb6e17e4b613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)如图1,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e9b5e076078240e0c5ad9763a9824d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f94c4f6b762fddb0e313050ef6932eb.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be1676826603a402116ecaca054a0fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)如果一次函数图象过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/149ee9d2da588990c54ec5199ad221ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e9b5e076078240e0c5ad9763a9824d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(3)如图3,以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://img.xkw.com/dksih/QBM/2019/10/21/2316780370083840/2317003798765568/STEM/b6ccf2ee50bc460ca6f83b6fa7cf1f87.png?resizew=492)
您最近一年使用:0次