1 . 如图,定直线
,点B、C分别为
、
上的动点,且
,
在两直线间运动过程中始终有
.点A是
上方一定点,点D是
下方一定点,且
,
,
,
,当线段
在平移过程中,
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/947aed0181a8c0bd81c6ebeba8d1ddc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8bc5b280bd514a754f289aae46e2cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfcffdc64658ffd973bac25b603e3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f951e874c46b9ee8ac55914f0ee5a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa82bb2a9dcf1dd7cec5b46c1f70f1d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1aac055263010139f6eb4df68f9d619.png)
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2 . 如图,五边形
,已知
,
,
,
,
,
,求出
最小时四边形
面积的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e0837b69ee47aa8a0cc9d3c3f91f1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8229203ab78d08d2d19b575d5d0babf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13aad1de92bc27ce203cbda8ad6672e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef3035ac1b400ef86a32448428dabfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7369f524ee35ee1f4694aca79f99816e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba63d391602d0798a1875da35fef40d.png)
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3 . 如图,在四边形
中,
,
,
,则
度数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a3128130301e2781aae635a8d71ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4433d70e8b5df6f0fafbd2d0878d54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
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4 . 如图,在四边形
中,
,若
,则
的度数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f7e352a9eabdbec2ef5fa0b3bc870e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50139f281e4d1a6d1dcb4f4327d7b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 如图,矩形
中,
,
,点
、
分别是
、
上的动点,
,则
的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476b0b8378f4b0f73f3dc5d84d89f616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498b007826b947fa0d19da0fc0aa52b6.png)
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名校
6 . 如图,折叠平行四边形
,使折痕经过点B,交
边于点E,点C落在
延长线上的点G处,点D落在点H处,得到四边形
.若平行四边形
的面积是8,则下列结论中正确的是( )
![](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/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474fa6f237d904bf46238e4fe3a59d8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.四边形![]() |
B.![]() |
C.设四边形![]() ![]() ![]() |
D.若![]() ![]() |
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7 . 如图,
,
,以B为圆心,
长为半径的圆弧交
于点E,连接
.若
,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5fc4ad65b723b6a8da4c8dac154e6e.png)
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d777d15cd733338ecfd0ea63819f62c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 如图,在
中,
,点D,E分别在边
上,若
,
,连接
交于点F,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/893bd35964001f6481611f8929bcf8a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d48e9deca35c034db4734cf9d2ddf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4591d4cbade5c26bc5467b9661064ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2bfa7a87a9c7120c20a3b55af313e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4be5ff69cf410d6dfd62f40f85708bce.png)
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2024八年级下·全国·专题练习
9 . 如图,在
中,
,点
在
上,
,且
,连接
,
,
交
于点
,
,
,则
的长度为 __ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1326e85ff750d882de9ea65c29e3d3b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c11737367f360184bad2952b38c3b170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/0e0db98e9240b9210e952b350820f5d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea92b709494d459cc8da1717692e6fbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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10 . 如图,在
中,
,点D,E分别为边
,
的中点,点F在
延长线上,且
.
;
(2)若
,
,求四边形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bee49a6c527d9369f3963aa38787fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a3600b1760a63a10c9a0429b439dc1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f5a152f235942d11c74ef518fca7bba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b79850d6b00a67110e77a33d1c46b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
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