如图,在四边形
中,
于点F,交BC于点G,交
的延长线于点E,且
.
;
(2)如图2,连接AG,若
,请直接写出图2中的三角形,使写出的每个三角形的面积是
面积的2倍.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54435c11ce0eab8d5f951555caf2305.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934a9508c176f44bf58f88715bd98f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d787c65f63d10bc4a63f2e1da51fd935.png)
(2)如图2,连接AG,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20227c155003de7163d407daf0a5e74.png)
更新时间:2024-04-16 16:54:59
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,分别以
的直角边
及斜边
向外作等边
,等边
,已知
,
,垂足为
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/ca680720-23e2-4561-91e5-68d79e05dd87.png?resizew=210)
(1)求证:
;
(2)四边形
是平行四边形吗?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/ca680720-23e2-4561-91e5-68d79e05dd87.png?resizew=210)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee206e603fb9da780781921fbe7f195a.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08c14e87a2bcf7090eab2fea73667d2.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,
与
的BC边相切于点B,与AC、AB边分别交于点D、E,
,EB是
的直径.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/21e6ffb8-2abf-489a-aff3-f4e41498d30f.png?resizew=123)
(1)求证:AC是
的切线;
(2)若
,
,求BC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa317c983e05adf97f25ba296d367fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/21e6ffb8-2abf-489a-aff3-f4e41498d30f.png?resizew=123)
(1)求证:AC是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】在学习角平分线的过程中,小琦遇到了这样一个问题:在梯形
中,
,若
平分
,且点E是
边的中点,则
.他的思路是:过点E作
的垂线,将其转化为证明三角形全等,进行转边,从而解决问题.请根据小琦的思路完成下面的作图与填空:
证明:用直尺和圆规,过点E作
于点F(保留作图痕迹)
平分
,
∴____①____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc45c88b67f721cb7a09d889659992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31814cc56f7f67a65d44be9f63675e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2678a54e023f97311f5d8178df2501b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1de828b99cae1c99401395a5d1eec41a.png)
又![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad4803e7b79b0fdc33323f91b97c611.png)
∴____②____(![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb8b968744573e593ac28451c69729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e1083b773e16d1e385072652f7319.png)
∵点E是
的中点,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9728a0240d2cefe20428ed0837a924cf.png)
在
与
中
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bbc115577cd400ad9b83b0102440c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a803b175eec8b510ca98bd3d36241e0d.png)
___③_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5154f5abf2b39f1c0ae036884715f2ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d8397018b0a01a1b4e9574604f9e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6feb71636e2e0482de54134eadad0ec8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
证明:用直尺和圆规,过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a2fd4be3ef6a91bab0592b98f69741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
∴____①____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc45c88b67f721cb7a09d889659992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31814cc56f7f67a65d44be9f63675e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2678a54e023f97311f5d8178df2501b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1de828b99cae1c99401395a5d1eec41a.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad4803e7b79b0fdc33323f91b97c611.png)
∴____②____(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb8b968744573e593ac28451c69729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dd24e448c7ed2974aa053e046dd728a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e1083b773e16d1e385072652f7319.png)
∵点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7b9571b06a676f20a28d0f38996fdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9728a0240d2cefe20428ed0837a924cf.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff3782e30f6f49071d4b5ad54c011a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734f99be638f65302533fa0a6a855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda91c138a9d926edaaab3295f1d7b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bbc115577cd400ad9b83b0102440c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a803b175eec8b510ca98bd3d36241e0d.png)
___③_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5154f5abf2b39f1c0ae036884715f2ce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/28/02aa7a9d-3b89-4c5d-813c-250cb182699d.png?resizew=108)
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,在平行四边形
中, 点E在
边上, 且 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72e4c1dd0dd96cd34e7c947ff311021.png)
上方作
使得
交
于点F.
(2)在(1)的条件下, 为了证明
小才的思路是:先证明
再结合平行四边形的性质,证明结论. 请根据小才的思路完成下面的填空.
证明:∵四边形
是平行四边形,
∴
,
∴
∵在
与
中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f204f544bc29bd88a67ae9281f6ab15.png)
∴
.
∴
.
∵四边形
是平行四边形,
∴
.
.
小才再进一步研究发现,若点E为
边上任意一点,在
上方作
,使得
,
交
于点F. 线段
的长度与平行四边形的某些边的长度均有此特征,请你依照题意完成下面命题:按上述要求得到的线段
的长度等于 (请填入:“E点所在的边与对边”或“E点不在的边与对边”)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72e4c1dd0dd96cd34e7c947ff311021.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ee23c0a763d62709a40b31cb7ac85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b555082018792daa658a4df57c57b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)在(1)的条件下, 为了证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67c7f6d2125d46359a72f7430b27192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8226c1050fc87017e3f03bfba215b3af.png)
证明:∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d63783f365e666ace307cadcaba60fa.png)
∵在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b661e9c73d13f918c4709267ab8332.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f204f544bc29bd88a67ae9281f6ab15.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba693327d2b532bf5d2980b610c84a76.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aebb5baea4ac1668b674a8634e15bcbc.png)
小才再进一步研究发现,若点E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd94dd51562ecbee6edd4265326b765.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9578b30c1cbef2f110d8cc51514302b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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