如图,在⊙O中,半径OA⊥弦BC,点E为垂足,点D在优弧上.
(1)若∠AOB=56°,求∠ADC的度数;
(2)若BC=6,AE=1,求⊙O的半径.
(1)若∠AOB=56°,求∠ADC的度数;
(2)若BC=6,AE=1,求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/2018/9/3/2024536899862528/2025185075724288/STEM/320e44fdff264d6484b3ace2ac22167a.png?resizew=104)
更新时间:2016-12-06 02:42:51
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【推荐1】如图,AB是半圆O的直径,且AB=
,矩形CDEF内接于半圆,点C,D在AB上,点E,F在半圆上.
![](https://img.xkw.com/dksih/QBM/2013/6/3/1573659738054656/1573659744411648/STEM/d3e7127c09b84a34a8ff9b1b7038c486.png?resizew=173)
(1)当矩形CDEF相邻两边FC︰CD=
︰2时,求弧AF的度数;
(2)当四边形CDEF是正方形时:
①试求正方形CDEF的边长;
②若点G,M在⊙O上,GH⊥AB于H,MN⊥AB于N,且△GDH和△MHN都是等腰直角三角形,求HN的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588c3822b7812e711b4ad86647b15dc1.png)
![](https://img.xkw.com/dksih/QBM/2013/6/3/1573659738054656/1573659744411648/STEM/d3e7127c09b84a34a8ff9b1b7038c486.png?resizew=173)
(1)当矩形CDEF相邻两边FC︰CD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)当四边形CDEF是正方形时:
①试求正方形CDEF的边长;
②若点G,M在⊙O上,GH⊥AB于H,MN⊥AB于N,且△GDH和△MHN都是等腰直角三角形,求HN的长.
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【推荐2】如图,圆O中两条互相垂直的弦AB,CD交于点E.
(1)M是CD的中点,OM=3,CD=12,求圆O的半径长;
(2)点F在CD上,且CE=EF,求证:
.
(1)M是CD的中点,OM=3,CD=12,求圆O的半径长;
(2)点F在CD上,且CE=EF,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39b13d187b25461d85a3b8d10c7b678.png)
![](https://img.xkw.com/dksih/QBM/2021/6/16/2743987829760000/2744144088064000/STEM/1329e525-21e3-44ca-ac26-4899f47610f1.png?resizew=244)
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【推荐1】如图,四边形
内接于
,对角线
平分
,连接
交
于点E.
.
(2)若
,设
的面积为
,
的面积为
,
,求
的值.
(3)求证:
.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95d478339f8c0b89cb2e7b4957778409.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b0d92ec67675317c97f8c499846d79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b5f2e5df0cde0fa30de2e14e627d68.png)
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【推荐2】如图,由小正方形构成的9×9网格,每个小正方形的顶点叫做格点,
经过A,B,C三个格点,仅用无刻度的直尺在给定网格中按要求画图.(保留连线痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/90bf6022-d5bc-45b9-8d75-434b9595d241.png?resizew=481)
(1)在图(1)中作线段
的垂直平分线;
(2)在图(2)中的
上画点E,使
;
(3)在图(3)中画出
的圆心O;在
上画出点F,使
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/90bf6022-d5bc-45b9-8d75-434b9595d241.png?resizew=481)
(1)在图(1)中作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在图(2)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f8688a3b7f65673722a11c9acc93b9.png)
(3)在图(3)中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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