如图,在平行四边形ABCD中,AB=3,AD=5,∠A=60°,点E是DC边的中点,P是边BC上的动点,PE的延长线与AD的延长线交于点F,连接PD,CF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/1496a764-b1a7-4a6d-a17c-a169cc2f9858.png?resizew=278)
(1)求证:四边形PCFD是平行四边形;
(2)当BP等于何值时,四边形PCFD是矩形?请说明理由;
(3)当BP等于何值时,四边形PCFD是菱形?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/1496a764-b1a7-4a6d-a17c-a169cc2f9858.png?resizew=278)
(1)求证:四边形PCFD是平行四边形;
(2)当BP等于何值时,四边形PCFD是矩形?请说明理由;
(3)当BP等于何值时,四边形PCFD是菱形?请说明理由.
更新时间:2022-07-17 16:39:32
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在
ABCD中,
,
,
,点E是边AB上的一点,点F是边CD上一点,将
ABCD沿EF折叠,得到四边形EFGH,点A的对应点为点H,点D的对应点为点G.当点H与点C重合时.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/2eb36740-99e2-49c5-aaf3-0786e54cacdd.png?resizew=152)
(1)填空:点E到CD的距离是______;
(2)求证:
;
(3)△CEF的面积为______;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784d093b48df0ba4ae15ea1368fe85e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/2eb36740-99e2-49c5-aaf3-0786e54cacdd.png?resizew=152)
(1)填空:点E到CD的距离是______;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8f812cca0b3a1a745f456ee48a5283.png)
(3)△CEF的面积为______;
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
于点D,G是
延长线上一点,
平分
,且
,E是
上一点,连接
并延长交
于点F.
(1)求证:
;
(2)猜想并证明:当E在
何处时,
.
![](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/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bbb90511e761c0aff7bc4673ab5d61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5457b6ee4ff862315a8357a54ce1d75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/27/19a54696-ef57-402c-a5dd-87b16b6c35b8.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)猜想并证明:当E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e63ebd12f01c7cdc6003bb226eadfd.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】在
中,
,D是
的中点,E是
的中点,过点A作
交
的延长线于点F.
是菱形;
(2)若
,
,求菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce7f6d278f2ef7a193b7eed7be6b3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6095bae4840bfa80f2468f94b2002d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a5a2949b3d520ed03d57126c7d4d8d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a5a2949b3d520ed03d57126c7d4d8d.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】在学习三角形中位线定理时,小丽发现作以下辅助线能够证明三角形中位线定理.
已知:如图1,在
中,点D,E分别是边
的中点,连接
.
求证:
,
.
证明:(小丽的辅助线作法)延长
到F,使
,连接
…
(1)请在图1中画出小丽所说的辅助线,并补全三角形中位线定理的证明过程;
(2)三角形中位线定理应用:如图2,在梯形
中,
,点E,F分别是
的中点,则线段
之间的数量关系是 .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/15/aced5448-5b28-4590-b581-3dfc3a1a296a.png?resizew=420)
已知:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e82a0f9712457f2dd9f8a93f8a217.png)
证明:(小丽的辅助线作法)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9a9618018d717926540d1452f76e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bba9a009b7333329a38d775c55b8db5.png)
(1)请在图1中画出小丽所说的辅助线,并补全三角形中位线定理的证明过程;
(2)三角形中位线定理应用:如图2,在梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b79c80cc81b5446dfac3ee97b03c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e449ef4ca245f6939855af28ecf3be.png)
您最近一年使用:0次
解答题-应用题
|
适中
(0.65)
【推荐1】随着测量技术的发展,测量飞机可以实现精确的空中测量.如图,为测量我国某海岛两端A、B的距离,我国一架测量飞机在距海平面垂直高度为2千米的点C处,测得端点A的俯角为30°,然后沿着平行于
的方向飞行5.82千米到点D,并测得端点B的俯角为57°.求某海岛两端
、
的距离(结果精确到0.1千米,参考数据:sin57°≈0.84,cos57°≈0.55 ,tan57°≈1.54,
≈1.73)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】图1,图2分别是某超市购物车的实物图与示意图,小江获得了如下信息:
,
,
,
,
,
,
,
.请根据以上信息,解决下列问题.(结果精确到
,参考数据:
,
,
)
所在直线的距离.
(2)求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86df2db64afa56281b23dd9e251c9bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab49647e8f50a47e3684abce60f64d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aacd9f32e3dc2021c7d8bbae96622d2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11893b2bfbee5b504a9099a367944c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/763e6c67df02d812ff9c039aaf9f9b07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dedd850930c6fe9c0c71cde46a4f339.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b0382c28547d3834ca71f3f0677695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd58f9f2603b2a02db40ca2bf9d17a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a1b68822169ec4cfb0e76a0a4ab2dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db936261aa0625846ad56e78c3647d8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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,
是
的直径,
,点F、C是
上两点,连接
、
、
,弦
平分
,
,过点C作
交
的延长线于点D,垂足为D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/fee79f28-32a7-4e81-9126-10c9f6eae4e2.png?resizew=143)
(1)求证:
是
的切线;
(2)求
的长.
![](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/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edabae47b9b9df627aaa281ca0f4e71a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36c0d4e38748fbb4a6cf5e700e5e874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c5fd65265f85df7d149d83d80d4e62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/fee79f28-32a7-4e81-9126-10c9f6eae4e2.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】问题提出
(1)如图1,
是等腰三角形,点D,E分别在腰
上,且
,连接
.若
,则
的长为_______.
问题探究
(2)如图2,在平行四边形
中,
,
,E为线段
延长线上的一点,连接
,求证:
.
问题解决
(3)王叔叔家门前有一块四边形空地
,王叔叔计划用该空地开发一个种植基地,如图3,经测量,
米,
米,
米,
米,并测得
,请依据相关数据帮王叔叔计算该四边形空地
的面积.
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9a415bdb7b4e1e35c18a9e53205392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8518c9bd112f86afb26eec99b01934d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/658e79e7-5cfa-4823-9638-e755f6c47217.png?resizew=99)
问题探究
(2)如图2,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/580a93c380d919150e893b85e934e809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8bb13740ac13266fe08f0f24948d5ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/4a68271c-8083-473b-b532-5191dc70ed3c.png?resizew=140)
问题解决
(3)王叔叔家门前有一块四边形空地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbb91d806e628cf978557ffad6a7020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce9c78403cf275d9804fbe994cc8515.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe22891897d4249be7c8f37d0f9a65a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab5b86ac5dac95ba4dd12b4f3af54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35395d90e938ac17ec2763bd1cfd65cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/d30760c9-fe57-4ee5-90d5-7dcc5c1aa698.png?resizew=123)
您最近一年使用:0次