如图,
是
的直径,C,D是
上两点,点C是
的中点,过点C作
的垂线,分别交
与
的延长线于点E和点F.
(1)判断
与
的位置关系,并证明;
(2)若
,通过计算比较
的直径与劣弧
的长度哪个更长.
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8b758913f0b039bba68f657380e1f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/0fb7e2e7-9897-4e00-9c45-1636939025fc.png?resizew=174)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba79a2a0733510666362cfc617dfb87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
更新时间:2023-06-18 06:04:07
|
相似题推荐
解答题-证明题
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适中
(0.65)
【推荐1】如图,在
中,
为直径,
为弦,连接
,
交于点P,且F为
的中点.
(1)求证:
;
(2)若
,求
的值.
![](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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b19c646bcb6160197fdf12a9cb31a0d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/14/b28c1106-85ed-4889-8aed-01500b48620e.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a5a5d4e307cafd9f1d1221d01cb45c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3decc1b786573e0fc08331f5402f97a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535ceeaa1cbe8318b1df5efcbebff584.png)
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名校
【推荐2】如图,AB是⊙O的直径,弦CD与AB交于点E,且E是CD的中点.
(1)求证:∠ADC=∠BDO;
(2)若CD=
,AE=2,求⊙O的半径.
(1)求证:∠ADC=∠BDO;
(2)若CD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/35b042ba-d7a6-4268-ac3e-17b45a701376.png?resizew=140)
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真题
【推荐1】如图1,在△APE中,∠PAE=90°,PO是△APE的角平分线,以O为圆心,OA为半径作圆交AE于点G.
![](https://img.xkw.com/dksih/QBM/2016/8/5/1574227849568256/1574227855958016/STEM/42c8a8545f504abbbfad5c4d20111713.png)
(1)求证:直线PE是⊙O的切线;
(2)在图2中,设PE与⊙O相切于点H,连结AH,点D是⊙O的劣弧
上一点,过点D作⊙O的切线,交PA于点B,交PE于点C,已知△PBC的周长为4,tan∠EAH=
,求EH的长.
![](https://img.xkw.com/dksih/QBM/2016/8/5/1574227849568256/1574227855958016/STEM/42c8a8545f504abbbfad5c4d20111713.png)
(1)求证:直线PE是⊙O的切线;
(2)在图2中,设PE与⊙O相切于点H,连结AH,点D是⊙O的劣弧
![](https://img.xkw.com/dksih/QBM/2016/8/5/1574227849568256/1574227855958016/STEM/45e021fc2d124a29afd98f3ccd5246a8.png)
![](https://img.xkw.com/dksih/QBM/2016/8/5/1574227849568256/1574227855958016/STEM/880cba6437234ebc9c6c90f4657749f2.png)
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【推荐2】如图,AB为
直径,点C为
上一点,过O作
,过C作
分别交AB,DO的延长线于点P,E,若
;
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968446131920896/2974112189300736/STEM/3b2eeb3d-dc0d-41eb-acf4-aaa15e2bf207.png?resizew=247)
(1)求证:CD为
切线;
(2)若
,
,求
的半径.
![](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/daab19a387d230fef54f07ffbcebdf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968446131920896/2974112189300736/STEM/3b2eeb3d-dc0d-41eb-acf4-aaa15e2bf207.png?resizew=247)
(1)求证:CD为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0e7d9f0b0acfa56820a8eabfead74a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐1】下图是一个桌面会议话筒示意图,中间
部分是一段可弯曲的软管,在弯曲时可形成一段圆弧,设圆弧所在圆的圆心为
,线段
,
均与圆弧相切,点
,
分别为切点.已知
的长
,
的长为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/5ab22aa7-9b15-4739-83de-73dbe48a03c3.png?resizew=399)
(1)如图1,若话筒弯曲后
与桌面
平行,此时
距离桌面
,求
的长度(结果保留
);
(2)如图2,若话筒弯曲后
所对的圆心角度数为60°,求话筒顶端
到桌面
的距离(结果保留一位小数,参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c280b0355df216440f40aefdcafcbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebc3541905ac9a54a4ac09bde2ec9ae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/5ab22aa7-9b15-4739-83de-73dbe48a03c3.png?resizew=399)
(1)如图1,若话筒弯曲后
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d59c6d9b504860487d7240ef603f1c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfe6ad3e9bcbea2cfe382c3e74628286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
(2)如图2,若话筒弯曲后
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfe6ad3e9bcbea2cfe382c3e74628286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
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【推荐2】如图,M,N是以AB为直径的⊙O上的点,且弧AN=弧BN,BM平分∠ABD,MC⊥BD于点C.
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363226962518016/2363713178517504/STEM/2d062ebc28724263a692dcc8f775b356.png?resizew=131)
(1)求证:MC是⊙O的切线.
(2)若BC=2,MC=4,求⊙O的直径.
(3)在(2)的条件下,求阴影部分的周长.
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363226962518016/2363713178517504/STEM/2d062ebc28724263a692dcc8f775b356.png?resizew=131)
(1)求证:MC是⊙O的切线.
(2)若BC=2,MC=4,求⊙O的直径.
(3)在(2)的条件下,求阴影部分的周长.
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【推荐1】如图,
是
的直径,过圆外一点
作
与
相切于
,交
的延长线于
,
于点
,交
于
、
两点,连接
交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/3/4/2670761436692480/2675409248108544/STEM/0e6e6d14-e3fb-4071-9e72-f570fd98c7e0.png?resizew=166)
(1)求证:
;
(2)连接
,若
,
,
,求
的半径长.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.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/f64912cf9f1bccc365532ab1cb26481a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://img.xkw.com/dksih/QBM/2021/3/4/2670761436692480/2675409248108544/STEM/0e6e6d14-e3fb-4071-9e72-f570fd98c7e0.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b70d4b41ac5da80deb2c153193b9f1.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e19bb384de4c166bb901e4eea9af32b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59022c3109c4a9cd2b07c9180de6761d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4b93a5a960f95c0b2f8bad9f6135a7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,直线
交x轴于点A(-1,0),交y轴于B点,
;过A、B两点的抛物线交x轴于另一点C(3,0).
![](https://img.xkw.com/dksih/QBM/2013/5/22/1573654904832000/1573654911131648/STEM/b457fb7ef5204b40b5a26f029f24863e.png)
(1)求直线AB的表达式;
(2)求抛物线的表达式;
(3)在抛物线的对称轴上是否存在点Q,使△ABQ是等腰三角形?若存在,求出符合条件的Q点坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2013/5/22/1573654904832000/1573654911131648/STEM/6c22480417aa43c7bde8b890c9629bf1.png)
![](https://img.xkw.com/dksih/QBM/2013/5/22/1573654904832000/1573654911131648/STEM/df258fa876044932b32f325114508587.png)
![](https://img.xkw.com/dksih/QBM/2013/5/22/1573654904832000/1573654911131648/STEM/b457fb7ef5204b40b5a26f029f24863e.png)
(1)求直线AB的表达式;
(2)求抛物线的表达式;
(3)在抛物线的对称轴上是否存在点Q,使△ABQ是等腰三角形?若存在,求出符合条件的Q点坐标;若不存在,请说明理由.
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