如图,
,
,
是
的内接三角形,
是
的直径,点 F 在
上, 连接
并延长,交
于点 D, 连接
, 作
垂足为 E.
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62eccb33ea66c03222468628f74d8c56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133760237c0ccf2d6a83786925b6d23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb49a110acec1e86b8e8969300f0cd2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.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/9b937442ad4cc480adc11bb143559454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9329d21f9f91da4ebe1dbcec99bc6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc39144b305c67d44410d41053a1d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
更新时间:2024-04-11 20:07:35
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相似题推荐
解答题-计算题
|
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【推荐1】阅读下面材料:
小明遇到这样一个问题:如图1,在△ABC中,DE//BC,分别交AB,AC于点D,E,已知CD⊥BE,CD=3,BE=5,求BC+DE的值.
小明发现,过点E作EF//DC,交BC延长线于点F,构造△BEF,经过推理和计算能够使问题得到解决(如图2).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/a29c9e34-9f37-43af-9798-1db50c34cfd0.png?resizew=108)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/b1051b73-e708-444f-be0a-560ff4e8badb.png?resizew=123)
(1)请回答:BC+DE的值为 ;
(2)参考小明思考的问题的方法,解决问题:如图3,□ABCD中,E是BC的中点,AE=9,BD=12,AD=10,求证:AE⊥BD.
小明遇到这样一个问题:如图1,在△ABC中,DE//BC,分别交AB,AC于点D,E,已知CD⊥BE,CD=3,BE=5,求BC+DE的值.
小明发现,过点E作EF//DC,交BC延长线于点F,构造△BEF,经过推理和计算能够使问题得到解决(如图2).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/a29c9e34-9f37-43af-9798-1db50c34cfd0.png?resizew=108)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/b1051b73-e708-444f-be0a-560ff4e8badb.png?resizew=123)
(1)请回答:BC+DE的值为 ;
(2)参考小明思考的问题的方法,解决问题:如图3,□ABCD中,E是BC的中点,AE=9,BD=12,AD=10,求证:AE⊥BD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/463fa6af-ce97-4403-8a1e-ecc6af81b8c0.png?resizew=175)
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解答题-问答题
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【推荐2】如图,
中,
,
平分
交
于点D,
交
于点E,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/2258e5b2-e122-46f3-a1b1-cf0a7f2aeeed.png?resizew=129)
(1)
的值为______ ;
(2)
的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8225b3e02f5a9f1fd5a09ada650cb78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7da3231c82642971f49315828d60fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/2258e5b2-e122-46f3-a1b1-cf0a7f2aeeed.png?resizew=129)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
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【推荐1】已知:
是
的直径,弦
于点G,E是直线
上一动点(不与点A、B、G重合),直线
交
于点F,直线
交直线
于点P.设
的半径为r.
(1)如图1,当点E在直径
上时,试证明:
;
![](https://img.xkw.com/dksih/QBM/2014/1/3/1573694531534848/1573694537359360/STEM/e8bd366f4f7d479991f78b5cbfaac8ed.png?resizew=172)
(2)当点E在
(或
)的延长线上时,以如图2点E的位置为例,请你画出符合题意的图形,标注上字母,(1)中的结论是否成立?请说明理由.
![](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/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(1)如图1,当点E在直径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40618b90d0aa89a5ed4bb25bc03026ba.png)
![](https://img.xkw.com/dksih/QBM/2014/1/3/1573694531534848/1573694537359360/STEM/e8bd366f4f7d479991f78b5cbfaac8ed.png?resizew=172)
(2)当点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://img.xkw.com/dksih/QBM/2014/1/3/1573694531534848/1573694537359360/STEM/1d7b66db8285406eaf8cd091c303cb51.png?resizew=178)
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解答题-证明题
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【推荐2】已知:如图,
内接于圆,
于D,弦
于E,交
于F.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ad0a87392245e4bf5bafe26089803b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a88657fd651b77585e8c10add921cb0.png)
![](https://img.xkw.com/dksih/QBM/2021/9/6/2802323057696768/2803150800101376/STEM/80866f23-3d98-423f-b184-d34b30b47974.png?resizew=242)
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解答题-作图题
|
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【推荐1】如图,已知
中,
,点
在边
上,请利用尺规作图法在
边上求作点
,使
.(不写作法,保留作图痕迹)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635487706623dfde87c61c4e287ea60a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/703388c4-cfd5-4660-a038-d2772b2c651a.png?resizew=161)
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【推荐2】如图1是对心曲柄滑块机构的模型示意图,滑块B和曲柄
的O端在一条直线上.在曲柄
绕回转中心O整周转动的过程中,通过连杆
使滑块B在直线
上往复运动.记直线
与
交于C,D两点(点D在点C的左侧).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/30/74966348-8072-4301-9a49-1468aa50a5c7.png?resizew=605)
(1)当连杆
与
相交于点E时,连接
,
,如图2所示.若
平分
,求证:
;
(2)当连杆
与
相切时,连接
,如图3所示.若曲柄
的长度为
,
,求连杆
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/30/74966348-8072-4301-9a49-1468aa50a5c7.png?resizew=605)
(1)当连杆
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3e762efb8c042132a73093de1dee9ce.png)
(2)当连杆
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815977a742fe2bd646c5b1f91f28aad4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d985475d471e6ddc3a0ae5795750af5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐1】(1)问题背景:已知,如图1,等腰△ABC中,AB=AC,∠BAC=120°,AD⊥BC于点D,AB=a,△ABC的面积为S,则有BC=
a,S=
a2.
(2)迁移应用:如图2,△ABC和△ADE都是等腰三角形,∠BAC=∠DAE=120°,D,E,C三点在同一条直线上,连接BD.
①求证:△ADB≌△AEC;
②求∠ADB的度数.
③若AD=2,BD=4,求△ABC的面积.
(3)拓展延伸:如图3,在等腰△ABC中,∠BAC=120°,在∠BAC内作射线AM,点D与点B关于射线AM轴对称,连接CD并延长交AM于点E,AF⊥CD于F,连接AD,BE.
①求∠EAF的度数;
②若CD=5,BD=2,求BC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e162b98c280720fcb909cf392fda3.png)
(2)迁移应用:如图2,△ABC和△ADE都是等腰三角形,∠BAC=∠DAE=120°,D,E,C三点在同一条直线上,连接BD.
①求证:△ADB≌△AEC;
②求∠ADB的度数.
③若AD=2,BD=4,求△ABC的面积.
(3)拓展延伸:如图3,在等腰△ABC中,∠BAC=120°,在∠BAC内作射线AM,点D与点B关于射线AM轴对称,连接CD并延长交AM于点E,AF⊥CD于F,连接AD,BE.
①求∠EAF的度数;
②若CD=5,BD=2,求BC的长.
![](https://img.xkw.com/dksih/QBM/2018/12/5/2090315731738624/2094505255895040/STEM/366c4ce5e8384924bedd994b4c513420.png?resizew=192)
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真题
名校
【推荐2】如图,在平行四边形ABCD中,AE平分∠DAB,已知CE=6,BE=8,DE=10.
(1)求证:∠BEC=90°;
(2)求cos∠DAE.
(1)求证:∠BEC=90°;
(2)求cos∠DAE.
![](https://img.xkw.com/dksih/QBM/2019/6/20/2229707631673344/2229743966289921/STEM/0ba0383a9cda4b1baf6ce59802cab810.png?resizew=285)
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