如图,已知AB是⊙O的直径,P是BA延长线上一点,PC切⊙O于点C,CG是⊙O的弦,CG⊥AB,垂足为D.
(1)求证:∠PCA=∠ABC.
(2)过点A作AE∥PC交⊙O于点E,交CD于点F,连接BE,若cos∠P=
,CF=10,求BE的长
(1)求证:∠PCA=∠ABC.
(2)过点A作AE∥PC交⊙O于点E,交CD于点F,连接BE,若cos∠P=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://img.xkw.com/dksih/QBM/2018/7/18/1991225906757632/1996854552879104/STEM/bba986e99d4e4597b4f277b72853b9d4.png?resizew=210)
更新时间:2018-07-26 15:53:53
|
相似题推荐
解答题-问答题
|
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【推荐1】如图,在四边形
中,
,
,
,
,
,点P从点A出发,以
的速度向点D运动;点Q从点C同时出发,以
的速度向点B运动.规定其中一个动点到达端点时,另一个动点也随之停止运动.设点P,Q运动的时间为
.
(1)
边的长度为
,t的取值范围为 .
(2)从运动开始,当t取何值时,
?
(3)从运动开始,当t取何值时,
?
(4)在整个运动过程中是否存在t值,使得四边形
是菱形?若存在,请求出t值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0b4a422f1a781f2c638d1322934442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7b6003550dc94d4ee3296b672a738d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da1e2130346c9923a733220b8b8be580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d20174abd01ef970c071df4e64cf777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa72baa3d35f01be6a67fe5e7309195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32729dbb477e7ac2184323f7d6a493fc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/30/4a7171f2-0a56-405d-8a3e-b7669d5446cd.png?resizew=179)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9179bee09452bbd0e5080501bb0ee9.png)
(2)从运动开始,当t取何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10bb426e00de29d8664ca5babb2f4f3.png)
(3)从运动开始,当t取何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8896ed0102f70210e9ba146f09ca0665.png)
(4)在整个运动过程中是否存在t值,使得四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b870b1c8c593543e2e0059e3fca9e2.png)
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【推荐2】如图,一次函数
的图象与x轴和y轴分别交于点A和B,再将
沿直线
对折,使点A与点B重合,直线
与x轴交于点C,与
交于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/4b235020-a7ae-42a0-bfad-cdf429ea881e.png?resizew=135)
(1)求点A和点B的坐标;
(2)求
的长度;
(3)在x轴上有一点P,且
是等腰三角形,不需计算过程,直接写出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b098e17fa76c648424e9cadf558cc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/4b235020-a7ae-42a0-bfad-cdf429ea881e.png?resizew=135)
(1)求点A和点B的坐标;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
(3)在x轴上有一点P,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
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【推荐1】以下虚线框中为一个合作学习小组在一次数学研讨中的过程记录,请阅读后完成虚线框下方的问题1~4.
试题分析
(Ⅰ)如图1,在
中,
,
,D是
外一点,且
.求
的度数.
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981451260272640/2982149087764480/STEM/27f4b12b-15d1-4d49-8bff-f3be36d57066.png?resizew=300)
小朋:我发现试题中有三个等腰三角形,设
,易知
,又因为AD
,得
,即可算出
的度数.
小丽:我发现
.则点B、C、D到点A的距离相等,所以点B、C、D在以点A为圆心,线段AB长为半径的图上……
猜想证明
(Ⅱ)如图1,在
中,
,
,点D、A在BC同侧.
猜想:若
______°,则点D在以点A为圆心,线段AB长为半径的圆上.
对于这个猜想的证明,小华有自己的想法:
以点A为圆心,AB长为半径出圆.根据点与圆的位置关系,可以知道点D可能在
内,或点D在
上,或点D在
外.故,只要证明点D不在
内,也不在
外,就可以确定点D一定在
上.
(Ⅲ)进一步猜想:
如图2,在
中,
,
,点D、A在BC同侧.若
______°,则点D在以点A为圆心,线段AB长为半径的圆上.
(Ⅳ)对(Ⅲ)中的猜想进行证明.
(1)完成(Ⅰ)中的求解过程:
(2)补全猜想证明中的两个猜想:(Ⅱ)______;(Ⅲ)______;
(3)证明上面(Ⅲ)中的猜想:
(4)如图3为某大型舞台实景投影侧面示意图,
,点A处为投影机,投影角
,折线B—O—C为影像接收区.若影像接收区最大时(即
最大),投射效果最好,请直接写出影像接收区最大时OB的长______.
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981451260272640/2982149087764480/STEM/f79853b6-64d2-4c74-ad10-4f90b56bede3.png?resizew=223)
图3
试题分析
(Ⅰ)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981451260272640/2982149087764480/STEM/27f4b12b-15d1-4d49-8bff-f3be36d57066.png?resizew=300)
小朋:我发现试题中有三个等腰三角形,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f6fb8fc16683efeff67b9ab9dce44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a39bcd9d466e067576bb898402baf2cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac80c8292324adda67673aeb6619f51b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2d36734f0f0c257a3ba86deee7f498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
小丽:我发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a83ed45064ec6e16c0024adfc8e2804.png)
猜想证明
(Ⅱ)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
猜想:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5c0e0724cce5c25a88dca5e9220c2.png)
对于这个猜想的证明,小华有自己的想法:
以点A为圆心,AB长为半径出圆.根据点与圆的位置关系,可以知道点D可能在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
(Ⅲ)进一步猜想:
如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a67a04ec500f0a63cbf83e439ce40d01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5c0e0724cce5c25a88dca5e9220c2.png)
(Ⅳ)对(Ⅲ)中的猜想进行证明.
(1)完成(Ⅰ)中的求解过程:
(2)补全猜想证明中的两个猜想:(Ⅱ)______;(Ⅲ)______;
(3)证明上面(Ⅲ)中的猜想:
(4)如图3为某大型舞台实景投影侧面示意图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/886c25cbaff27a9c4cf52dacec0eac4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc11dbe7cfe3cadb24847e9f93b049c.png)
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981451260272640/2982149087764480/STEM/f79853b6-64d2-4c74-ad10-4f90b56bede3.png?resizew=223)
图3
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【推荐2】已知:
是
的直径,C为
上一点,将
绕着点B逆时针旋转一定的角度得到
,
交
于E点,若点D在
上,连接
交
于点F.
与
的位置关系;
(2)求证:
;
(3)若
,
,求阴影部分的面积.
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.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/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e59617707e98c3441445392333b491.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb6823a329628699619a39cde927510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4297fd1f6b4a90ec1ea2c003356812a.png)
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【推荐1】如图,
是
的外接圆,点
在
边上,
的平分线交
于点
,连接
,
,过点
作
的切线与
的延长线交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/1f5078cc-4f75-45de-9f90-c85e5615bf8d.png?resizew=220)
(1)求证:
;
(2)求证:
;
(3)当
,
时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/1f5078cc-4f75-45de-9f90-c85e5615bf8d.png?resizew=220)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303154af3664f7152bb67aa890fe5252.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec10011475d1dc7896e8c5f6242571ee.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fae188b381c5ba01b3d9d742c687dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
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【推荐2】如图,在矩形
中,
经过点A,与矩形的两边相切,切点分别为E,F,与边
相交于点G.连
并延长交边
于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/394bd343-c03f-46b7-8d08-8ac7fa6573b9.png?resizew=123)
(1)求证:
;
(2)若
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/e5a122e25cf4eb9f03ffe5ec823bfc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/394bd343-c03f-46b7-8d08-8ac7fa6573b9.png?resizew=123)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d5942a81561bf6617281126e97e5595.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d579705ff858c2f0e835122a79455a01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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【推荐1】如图,在△ABC中,以AC为直径作⊙O交BC于点D,交AB于点G,点D是BC的中点,过点D作⊙O的切线,交AB于点E,交AC的延长线于点F.
![](https://img.xkw.com/dksih/QBM/2022/2/27/2925400591073280/2939461928484864/STEM/324c29e5-ac42-4028-96ad-009be2de13b5.png?resizew=124)
(1)求证:EF⊥AB;
(2)若CF=5,
,求BE的长.
![](https://img.xkw.com/dksih/QBM/2022/2/27/2925400591073280/2939461928484864/STEM/324c29e5-ac42-4028-96ad-009be2de13b5.png?resizew=124)
(1)求证:EF⊥AB;
(2)若CF=5,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abe033b3e78d93c5f949cccfae6d198.png)
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【推荐2】如图,已知
是
的直径,直线
与
相切于点
,过
作
,
为垂足.
求证:
;
若
,
,求
的直径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf6101c529b7868bc1c2fd46aca16bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edbe289ad89a4243903108709ce0381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc2730277cbe81789d071e235bc9315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edbe289ad89a4243903108709ce0381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f015ed8e497b4394053ddd19683a98f.png)
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