如图梯形ABCD中AD//BC,AE⊥BC于E,∠ADC的平分线交AE于点O,以点O为圆心,OA为半径的圆经过点B,交BC于另一点F.
(1)求证:CD与⊙O相切;
(2)若BF=16,OE=6,求AB的值.
(1)求证:CD与⊙O相切;
(2)若BF=16,OE=6,求AB的值.
![](https://img.xkw.com/dksih/QBM/2021/1/10/2633190995542016/2633263519506432/STEM/1cbf3bb7a7554bc3931f4846b5f480b8.png?resizew=163)
更新时间:2021-01-10 19:31:15
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】在解决线段数量关系问题中,如果条件中有角平分线,经常采用下面构造全等三角形的解决思路,如:在图1中,若C是∠MON的平分线OP上一点,点A在OM上,此时,在ON上截取OB=OA,连接BC,根据三角形全等判定(SAS),容易构造出全等三角形
OBC和
OAC,参考上面的方法,解答下列问题,如图2,在非等边
ABC中,∠B=60°,AD、CE分别是∠BAC、∠BCA的平分线,且AD、CE交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/69704a2c-52d8-4336-aee1-e974bc55bfe5.png?resizew=455)
(1)求∠AFC的度数;
(2)求证:AC=AE+CD.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/69704a2c-52d8-4336-aee1-e974bc55bfe5.png?resizew=455)
(1)求∠AFC的度数;
(2)求证:AC=AE+CD.
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图所示,在
中,
.
(1)尺规作图:过点
作
的角平分线
(不写作法,保留作图痕迹);
(2)在
上任取一点
,连接
、
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/fc3d899a-f821-4916-82c3-c0178eeaac10.png?resizew=137)
(1)尺规作图:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee1987b504c51650f055eaa0be2836.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是
的直径,点C在
上,过点C作
交
于点E,交
于点D,连接
交
于点G,连接
,设
(m为常数).
;
(2)设
,
.求证:
;
(3)求
的值(用含m的代数式表示).
![](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/7e68633cbbe3cc2d0801305f81a7aa86.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01aad59e03413e08322b1de6a8324893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c574632e8f09c232a029854e473a651b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3b86af94cc1981fbcac6751fed3032f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a60a056983245a65349a09b6b4c4cc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f85154249b25b32dc03b354b3ecc50cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b66c9db64497e6d930f6e2224c9d639.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b7a3f781c62f2090eb7ecfcd64ccf94.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在⊙O中.
(1)若
,∠ACB=80°,求∠BOC的度数;
(2)若⊙O的半径为13,且BC=10,求点O到BC的距离.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5142949086fdc50bacd01b9ab9202320.png)
(2)若⊙O的半径为13,且BC=10,求点O到BC的距离.
![](https://img.xkw.com/dksih/QBM/2020/11/3/2584913149870080/2586351591006208/STEM/28bf98fc69f844ba8e897f289cf2c23c.png?resizew=154)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】AB为⊙O直径,BC为⊙O切线,切点为B,CO平行于弦AD,作直线DC.
(1)求证:DC为⊙O切线;
(2) 若AD·OC=8,求⊙O半径.
(1)求证:DC为⊙O切线;
(2) 若AD·OC=8,求⊙O半径.
![](https://img.xkw.com/dksih/QBM/2017/5/18/1689515028152320/1692902849216512/STEM/a4f964f979ed49418c46902f71c0e8f8.png?resizew=112)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,
为
的直径,
为
上两点,且
为弧
的中点,过点
作
的垂线,交
的延长线于点
,交
的延长线于点
,连结![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)求证:
是
的切线;
(2)当
时,求
的长.
![](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/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3100180e0c5e5629049c55118f61b6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2020/11/23/2599127601209344/2604702696275968/STEM/b4b5d93d7fea43ca8afe162bb8626fde.png?resizew=186)
您最近一年使用:0次