真题
1 . 康康在学习了矩形定义及判定定理1后,继续探究其它判定定理.
(1)实践与操作
②以点
为圆心,适当长为半径画弧,在两条直线上分别截取相等的四条线段
;
③顺次连结所得的四点得到四边形
.
于是可以直接 判定四边形
是平行四边形,则该判定定理是:______.
(2)猜想与证明
通过和同伴交流,他们一致认为四边形
是矩形,于是猜想得到了矩形的另外一种判定方法:对角线相等的平行四边形是矩形.并写出了以下已知、求证,请你完成证明过程.
已知:如图,四边形
是平行四边形,
.求证:四边形
是矩形.
(1)实践与操作
②以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02eeccf647a3c8c0247149ce3190d995.png)
③顺次连结所得的四点得到四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
于是可以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)猜想与证明
通过和同伴交流,他们一致认为四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
已知:如图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2 . 综合实践课上,老师让同学们利用尺规借助直角三角形
作矩形,如图是甲、乙、丙三名同学作的矩形,其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
A.甲和丙 | B.乙和丙 | C.甲和乙 | D.都正确 |
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3 . 一个木匠要制作矩形踏板,如图,他先在一个对边平行的长木板的一边做一个点标记A,然后在对边任一点再做一个标记B,连接
,取
中点O,则以下操作与判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.过点O作任意直线交木板两边于![]() ![]() ![]() |
B.过点O作![]() ![]() ![]() ![]() |
C.在木板上任意找两点![]() ![]() ![]() ![]() |
D.分别过点![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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4 . 下列说法中错误 的是( ).
A.对角线互相垂直且相等的四边形是矩形 |
B.角的内部,到角的两边距离相等的点在这个角的角平分线上 |
C.顺次连接四边形各边中点所得图形是平行四边形 |
D.在同圆或等圆中,同弧所对的圆心角是圆周角的2倍 |
您最近一年使用:0次
5 . 如图,在平行四边形
中,分别以点B和D为圆心,以小于
长度的长度为半径,在线段
和
上分别画弧,得到交点E和F,即可得到
,连接
,
,
,
,
.设
的面积为
,
的面积为
.
是矩形;
(2)若
,
,
,求点C到
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d6e7ef3f341fd85acde9f60eaaff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36691f0269294ecae8f00b7bce97756c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df049f15adb6667113ceee3a6638cd0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f878035f533601a563b924923740f3d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
7日内更新
|
202次组卷
|
2卷引用:2024年云南省玉溪市红塔区初中学业水平模拟考试九年级数学试题
6 . 如图,
,以
为半径,O为圆心作圆交射线
于点B.仍以
为半径,分别以A和B为圆心作弧交
于点C和D.顺次连接A,C,B,D,则四边形
的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
A.![]() | B.![]() | C.8 | D.12 |
您最近一年使用:0次
名校
7 . 小南在学习矩形的判定之后,想继续研究判定一个平行四边形是矩形的方法,他的想法是作平行四边形两相邻内角的角平分线,与两内角公共边的对边相交,如果这相邻内角的顶点到对应交点的距离相等,则可论证该平行四边形是矩形.
平分
交
于点
;
(2)已知:如图,在平行四边形
中,
平分
交
于点E,
平分
交
于点
,且
.求证:平行四边形
是矩形.
证明:
,
分别平分
,
,
,
.
四边形
为平行四边形,
,
,
① ,
,
,
,
② ,
,
,
.
在
和
中
,
.
,
,
,
③ ,
平行四边形
是矩形.
小南再进一步研究发现,若这组邻角的角平分线与公共边的对边延长线相交,结论仍然成立.因此,小南得出结论:作平行四边形两相邻内角的角平分线,与两内角公共边的对边(或对边延长线)相交,若这相邻内角的顶点到对应交点的距离相等,则 ④ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)已知:如图,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f85f511236e5645290b9d06984558ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a8713b0b50e00ddc0baffeb62c6e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8d3818fd5e3e36be27d898e8062a5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e8644afba5451902a1d517ec584877a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9391370e7d493c4a1e75d25159523cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b207fd68ab1014f74d190e30a68040ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c96cd3c230f63e7acf5053b2b255c95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2754b35a7932e36312a71b0d0c3f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8cf51d8ce4ad7e0e7355b6a1ff970fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e94399c4924cf2a862737a2825fe4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3411384689995f6c3ff4108d1ffcbad.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13668f033d00acfc366f7e47949c4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b271d76c06d1aaea92b30c34d0d92d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70514b699c177fc53721c8251b04c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5279bd0b34bff51b7fe30b9c90c5d7e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe9353e99abfcf4048066770298aea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/844d86fb77ca8ec443f0bc073d4a68c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
小南再进一步研究发现,若这组邻角的角平分线与公共边的对边延长线相交,结论仍然成立.因此,小南得出结论:作平行四边形两相邻内角的角平分线,与两内角公共边的对边(或对边延长线)相交,若这相邻内角的顶点到对应交点的距离相等,则 ④ .
您最近一年使用:0次
2024-06-07更新
|
231次组卷
|
2卷引用:2024年重庆市巴蜀中学校中考压轴考试(二模)数学试题
8 . 已知菱形
,
,
,点
,
,
,
分别在菱形
的四条边上,
.连接
.有下列结论:①四边形
是矩形;②
长有两个不同的值,使得四边形
的面积都为
;③四边形
面积的最大值为
.其中,正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cd4a1c8087ef697d82b321a3331211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90a6ccc04c542685824135387bd93374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3347b54bd743c8a9a41becc72e3f623f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9829733240df90d85e5349c3dc5985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241734bf5c68efd4ffd57d9b7e0329e2.png)
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
9 . 如图,
平分
,点A是射线
上一点,过点A作
交
于点D,过A作
,过点D作
.
是矩形;
(2)在
上取点C使得
,连接
、
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67800256d1b208743f9b0e443076f071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0e65e147b109f2bbfd3a3f502bbc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec3798dfdc28221bf0a0eda51115fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999a995a6d07c561ce64e8952994160a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c791fb90cf7b021f4403bfb25523191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2c4096f1fef8ca57b38f5d8023288e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8057131f4bae6260aaeda1eb3c77fb7c.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604cb37737fc9d58e19c73149105bb24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03e2fe10b196dbe620dde9cfe1228ff7.png)
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10 . 在平行四边形
中,连接
,
,将
沿着对角线
翻折,使点D落在
处,连接
,
与
交于E,连接
.
的形状,并说明理由;
(2)若平行四边形
的周长为32,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f462d4f4c2889c44230e62212ed05f.png)
(2)若平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/444ae55706590660b93a0c73f58dad48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f462d4f4c2889c44230e62212ed05f.png)
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