在
中,弦CD与直径AB相交于点P,
.
(1)如图1,若
,求
和
的大小;
(2)如图2,若
,过点D作
的切线,与AB的延长线相交于点E,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ca6846b7008e5f5fa68972cefcd6cd.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6632eb0ec088b390f2bbd4205c29a2e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d16fab0f52c8af5abba0bf19a06ea0.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
![](https://img.xkw.com/dksih/QBM/2021/9/10/2805304953389056/2805882067582976/STEM/d5bf315b8c16490fb80b0b3fc1435bb7.png?resizew=399)
更新时间:2021-09-11 16:44:35
|
相似题推荐
解答题-证明题
|
较易
(0.85)
【推荐1】在
中,
,
的垂直平分线交
于N,交
的延长线于M,
度.
的度数;
(2)若将
的度数改为80°,其余条件不变,再求
的大小;
(3)你发现了怎样的规律?试证明;
(4)将(1)中的
改为钝角,(3)中的规律仍成立吗?若不成立,应怎样修改.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2874634649312b86a52d05e96662a44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a742abf1b0702125a0c77cbfbef118ca.png)
(2)若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a742abf1b0702125a0c77cbfbef118ca.png)
(3)你发现了怎样的规律?试证明;
(4)将(1)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
名校
【推荐1】如图,
是⊙O的直径,
是⊙O的一条弦,且
于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/a1cff185-180d-4149-ad08-2846f97c8a78.png?resizew=136)
(1)求证:
;
(2)若
,
,求⊙O的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/a1cff185-180d-4149-ad08-2846f97c8a78.png?resizew=136)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ac5998620b6821d6e58b62901806c3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5713d1a64003579a8daec80c5a55b939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fc28f622892dd18bbbac95d541acfe.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】已知
为
的直径,
为
上一点,连接
.
(1)如图1,若点
为半圆的中点,求
的长;
(2)如图2,连接
,点
在
外,连接
交
于点
,此时,
平分
,
,求证,
是
的切线;
(3)如图3,在(2)问的条件下,连接
,若
,求
.
![](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/f2097463b4813485e37f201e1a05a75c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/c966717b-30bd-4e45-95eb-09b207e89619.png?resizew=380)
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/50340e2a6f894544f6e626c849a22959.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cfd06965af6014208127f2880b476b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)如图3,在(2)问的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3425ddcc525649add147f0b18e8432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/144245c0fd5101a3bda0797bbe4a0681.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746c263332839f1456c357f8f54b593e.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐1】如图,
是
的直径,
是
的弦,延长
到点
,使
,连接
,交
于点
.求证:
;
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/f0145eeb463f49ec362d52ef68dab367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://img.xkw.com/dksih/QBM/2021/12/13/2871684512808960/2882103649386496/STEM/02e4e43fddec4601be04050d5be677d4.png?resizew=162)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐2】如图,
是圆O的直径,D是弧
的中点,四边形
的对角线
交于点E,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
,
.
![](https://img.xkw.com/dksih/QBM/2023/3/27/3203441126211584/3208037050540032/STEM/f8e046b44ee245779e346906817efd80.png?resizew=149)
(1)求
的长;
(2)求直径
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd516e4b396722941982a389ee6e524c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://img.xkw.com/dksih/QBM/2023/3/27/3203441126211584/3208037050540032/STEM/f8e046b44ee245779e346906817efd80.png?resizew=149)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求直径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐1】已知AB是⊙O的直径,C为⊙O上一点,∠OAC=58°.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/f75c5c8d-c5a9-4e9e-814d-f7f0726425d0.png?resizew=345)
(Ⅰ)如图①,过点C作⊙O的切线,与BA的延长线交于点P,求∠P的大小;
(Ⅱ)如图②,P为AB上一点,CP延长线与⊙O交于点Q.若AQ=CQ,求∠APC的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/f75c5c8d-c5a9-4e9e-814d-f7f0726425d0.png?resizew=345)
(Ⅰ)如图①,过点C作⊙O的切线,与BA的延长线交于点P,求∠P的大小;
(Ⅱ)如图②,P为AB上一点,CP延长线与⊙O交于点Q.若AQ=CQ,求∠APC的大小.
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
名校
【推荐2】如图,已知AB是⊙O的直径,点P在BA的延长线上,AB=BE,PD切⊙O于点D,交EB于点C,连接AE,点D在AE上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/c424250a-94c9-4489-8c0e-6a70bb08f933.png?resizew=196)
(1)求证:BE⊥PC;
(2)连接OC,如果PD=
,∠ABC=60°,求OC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/c424250a-94c9-4489-8c0e-6a70bb08f933.png?resizew=196)
(1)求证:BE⊥PC;
(2)连接OC,如果PD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
您最近一年使用:0次