如图,将⊙O上的
沿弦BC翻折交半径OA于点D,再将
沿BD翻折交BC于点E,连结DE.若AB=10,OD=1,则线段DE的长为( )
![](https://img.xkw.com/dksih/QBM/2020/3/9/2415708559843328/2415951596322816/STEM/252b7648fefc4011835ba8a269511337.png?resizew=181)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
![](https://img.xkw.com/dksih/QBM/2020/3/9/2415708559843328/2415951596322816/STEM/252b7648fefc4011835ba8a269511337.png?resizew=181)
A.5 | B.2![]() | C.2![]() | D.![]() |
更新时间:2020-03-09 18:49:01
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相似题推荐
单选题
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(0.65)
【推荐1】如图,将菱形纸片
折叠,使点A恰好落在菱形的对角线交点O处,折痕为
,若菱形
的边长为
,
,那么
为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/bc7a2669-f31d-4aba-96fa-d012f4f9f4bf.png?resizew=173)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab4a92bf822e175d370e6d0c8a730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/bc7a2669-f31d-4aba-96fa-d012f4f9f4bf.png?resizew=173)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在等腰直角△ABC中,
,O是斜边AB的中点,点D、E分别在直角边AC、BC上,且
,DE交OC于点P.给出下列结论:
(1)AD=CE;
(2)
;
(3)△ABC的面积等于四边形CDOE的面积的2倍;
(4)
.
其中正确的结论有( )个.
![](https://img.xkw.com/dksih/QBM/2022/3/30/2947433310494720/2965272524537856/STEM/6193bbba-ab4c-4b5e-af73-9089eb09b37c.png?resizew=202)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95a92fcd0cd5e55f1d32d42504a5690.png)
(1)AD=CE;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03242e2917ecf1f5977de97b47ac0ea1.png)
(3)△ABC的面积等于四边形CDOE的面积的2倍;
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7dc4cd3ccef9636e1f8caebb0cef63.png)
其中正确的结论有( )个.
![](https://img.xkw.com/dksih/QBM/2022/3/30/2947433310494720/2965272524537856/STEM/6193bbba-ab4c-4b5e-af73-9089eb09b37c.png?resizew=202)
A.4 | B.3 | C.2 | D.1 |
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【推荐1】已知点
、
、
、
、
、
是半径为
的
的六等分点,分别以
、
为圆心,
和
长为半径画圆弧交于点
以下说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/9/16/3067786384457728/3082049960304640/STEM/273d8fa05df34005a1c831b7699329d5.png?resizew=138)
①
;
②
≌
;
③
;
④
:
:
:
:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8b201c0b1a56b34d73edd645222957a.png)
![](https://img.xkw.com/dksih/QBM/2022/9/16/3067786384457728/3082049960304640/STEM/273d8fa05df34005a1c831b7699329d5.png?resizew=138)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7142e7513a1b7d864489d6e9392e983.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d0151288363337e743d5796b952473.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8329d37c1f86fe573a0bf14ff877bf82.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
A.①④ | B.②③ | C.③④ | D.①②③④ |
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【推荐2】下列说法正确的个数有( )
①半圆是弧;
②面积相等的两个圆是等圆;
③所对的弦长相等的两条弧是等弧;
④如果圆心角相等,那么它们所对的弦一定相等;
⑤等弧所对的圆心角相等;
⑥平分弦的直径,平分这条弦所对的弧.
①半圆是弧;
②面积相等的两个圆是等圆;
③所对的弦长相等的两条弧是等弧;
④如果圆心角相等,那么它们所对的弦一定相等;
⑤等弧所对的圆心角相等;
⑥平分弦的直径,平分这条弦所对的弧.
A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐2】如图
,
是
的切线,
、
为切点,
为
的直径,弦
,则下列选项错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/70734a8e672376bb0bd1522e229f86a2.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐1】如图,在
中,直径
与弦
相交于点
,连接
,
,
,若
,
,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81131259f548e8803da8dec25fb644c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b6ce13e7d80b9d369332ce400b7921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,AD是
的高,AE是
外接圆的直径,圆心为点O,且AC=5,DC=3,
,则AE等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/28/2b4c36f6-040d-416d-8f51-ed8bd8595a9c.png?resizew=143)
A.![]() | B.![]() | C.![]() | D.5 |
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