如图,
是
的角平分线,
,
分别是
和
的高.
,
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b78b012806a8fd298b7fe26855f327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a665483a456fba49b538e6f320b3e2a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
更新时间:2024-05-22 19:39:52
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在
中,
,
平分
.
(1)若
,
,求
的度数;
(2)小明认为如果只知道
,也能得出
的度数,你认为可以吗?若能,请你写出求解过程;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8648cc68448cb78e36cff296b912ea46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146a63bac5ecd239f2696801e8eaa0b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/a449f590-9dc9-4fb9-9260-650d49e6919d.png?resizew=220)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb49ae24de2f8990b0b04ebefbd8e65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a39b87f77f6f0a62db7a3ecda126fdec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1caed8e8c73589dab6dba2bde590a735.png)
(2)小明认为如果只知道
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ab0adfcb0c672a1d53191eeca92282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1caed8e8c73589dab6dba2bde590a735.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,已知
、
分别是
的高和中线
,
,
.试求:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/c47619e2-0eb5-4371-a32c-73c446209953.png?resizew=195)
(1)
的面积;
(2)
的长度;
(3)
与
的周长的差.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3463c0a0a86f359b3eda967853d81408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f5e900da706536c57f7c1ae7a1174a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/c47619e2-0eb5-4371-a32c-73c446209953.png?resizew=195)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】已知
的面积是60,请完成下列问题:
是
的
边上的中线,则
的面积______
的面积.(填“>”“<”“=”)
(2)如图2,若
、
分别是
的
、
边上的中线,求四边形
的面积可以用如下方法,连接
,由
得:
,同理:
,设
,
,则
,
由题意得:
,
,可列方程组为:
,解得______,则可得四边形
的面积为______.
(3)如图3,
,
,则四边形
的面积为______.
(4)如图4,D,F是
的三等分点,E,G是
的三等分点,
与
交于O,且
,则四边形A
的面积为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421db5f1776e5155c286930e8123d25c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e37b122a7273e1251ea3860e74c896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f855c80172c04310d342f82d960011ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9777234a1787e94c29d75929ad1df698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc5ccebf4b23c5b1ee67db3db9a8233c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c96702edfc569959f39786661128ca5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c77ab4545ea6d8412651b2e0ab39ffff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a73f61fae34dcff15b0d601594f06028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5490a6b0c44410c9c12cc9665b88cd17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba48167f12f2662173ef948174785c9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1aae37df2d2c45eb285c09cd7fd43f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0016aa2f40dcc86e3e9bbddc2fb07d06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421db5f1776e5155c286930e8123d25c.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cd58557c95794e629c39966949515b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f00ef63f2c167a55206ba0912ea50b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421db5f1776e5155c286930e8123d25c.png)
(4)如图4,D,F是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b49022a6f55817b5d7e3ab443b5491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4af08deb315d34196aea2550be4f7330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24d5a8cf34ee380d4dc545518589e06a.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在正方形ABCD中,点F是BC延长线上一点,BE⊥DF,垂足为E,BE交CD于点G.求证:BG=DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/20/bdb2dfbd-51c8-4989-b5bc-d059c5f5a71e.png?resizew=149)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在△ABC中,AB=AC,BD、CE分别是边AB、AC上的高,BD与CE交于点O.求证:BO=CO.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/d7b8551d-2ba7-4aca-9b69-51c193a81aed.png?resizew=189)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,
中,
,
的平分线交
于点
.
![](https://img.xkw.com/dksih/QBM/2022/12/2/3122301076414464/3158575223717888/STEM/bc957fb965924b3d9fe87a82da87a817.png?resizew=209)
(1)尺规作图:作
的垂直平分线,分别交
、
、
于点
、
、
,连接
、
;(不写作法,保留作图痕迹)
(2)在(1)中所作的图形中,求证:
.补全下列证明过程:
证明:∵
垂直平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
∴
,
___________①___________
∵
平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
∴___________②___________
在
和
中,
,
∴
,∴___________④___________
∴
![](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/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2022/12/2/3122301076414464/3158575223717888/STEM/bc957fb965924b3d9fe87a82da87a817.png?resizew=209)
(1)尺规作图:作
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)在(1)中所作的图形中,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a3600b1760a63a10c9a0429b439dc1.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2779662cf36bab7e33534c1ace192281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
∴___________②___________
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00870385ca7f3214e2971779eb4c7904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7572ecc467c061ef71cf4486ec63ec3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5eda4461c717f0c69037c3548631a7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936f4299ccd3ac4737416facc000b92c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a3600b1760a63a10c9a0429b439dc1.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
【推荐2】如图,已知
,
为射线
上两点,
的垂直平分线交射线
与点
,交射线
与点
,连接
,过点
作
的垂线,垂足为
,延长
交
的反向延长线于点
.
![](https://img.xkw.com/dksih/QBM/2022/3/29/2946680845942784/2947995148582912/STEM/911fd59c-a382-40ad-94bf-9b176681ffc6.png?resizew=231)
(1)依题意补全图形,令
,则
______.(用
表示)
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3518607a3c69d8104c09dcc5f4016b.png)
(3)用等式表示线段
、
和
的关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6b253b7f7aa120fa6dd980bfc5fabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2022/3/29/2946680845942784/2947995148582912/STEM/911fd59c-a382-40ad-94bf-9b176681ffc6.png?resizew=231)
(1)依题意补全图形,令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d356fb2ad209e0933e564c343eb19fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41db498f025052df2dbb1e50ab672675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3518607a3c69d8104c09dcc5f4016b.png)
(3)用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
您最近一年使用:0次
解答题-应用题
|
适中
(0.65)
【推荐1】如图①是放置在水平桌面上的台灯的截面示意图,台灯底座的高
为
,长度均为
的连杆
与
始终在同一平面上.
,使
成平角,
,如图②,求连杆端点
离桌面的高度
是多少
?
(2)将图②中的连杆
绕点
顺时针旋转,使
,再将连杆
绕点
逆时针旋转,使
,如图③,此时连杆端点
离桌面的高度
又是多少
?(结果精确到
,参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a9eed64d225267a58cd001db67e2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe9f7abf7bcf4e1aa2579cd191d7761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)将图②中的连杆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b755ee4dda4a72063c6fba125720a4.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】平行四边形
的对角线相交于点M,
的外接圆交
于点E且圆心O恰好落在
边上,连接
,若
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/38223290-a60d-4672-9487-b2a124dcb7a0.png?resizew=203)
(1)求证:
为
切线;
(2)求
的度数;
(3)若
的半径为1,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386c7de62e8f9a8161ebaefe6b4ec35e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/38223290-a60d-4672-9487-b2a124dcb7a0.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
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