已知:如图1,在四边形
中,
,四边形
是平行四边形,
交
于点E,连接
.
(1)求证:
;
(2)如图2,连接
交
于点G,连接
,若
.求证:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ada52a0dae5711ac607f5384b2532a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85719346f464a101d365d42be27450a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd75c292db55f8042b48772614c1f8c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/25/38f4c867-99e9-4e70-b4f4-466076435905.png?resizew=300)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f01cc49bb299e4cc9c8305aa912905.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac9d8b003ae2b6ac5d20f4b85097be4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2081a4c8c4c6cf702451ec0062201d4.png)
更新时间:2023-09-12 18:34:49
|
相似题推荐
解答题-作图题
|
适中
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【推荐1】已知,如图,在△ABC和△DEF(它们均为锐角三角形)中,AC=DF,AB=DE.
(1)用尺规在图中分别作出AB、DE边上的高CG、FH(不要写作法,保留作图痕迹).
(2)如果CG=FH,猜测△ABC和△DEF是否全等,并说明理由.
(1)用尺规在图中分别作出AB、DE边上的高CG、FH(不要写作法,保留作图痕迹).
(2)如果CG=FH,猜测△ABC和△DEF是否全等,并说明理由.
![](https://img.xkw.com/dksih/QBM/2019/6/20/2229587498549248/2230610911059968/STEM/e5c7d52cc5b34b37b8894c84c5652804.png?resizew=279)
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解答题-证明题
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名校
【推荐2】如图,AC、BD相交于点O, AB=AD,BC=CD.求证:AC⊥BD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/7ef5c171-c9e9-494f-8d94-9abd80968450.png?resizew=161)
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解答题-证明题
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【推荐3】数学活动课上,老师利用平分角的仪器的工作原理引入了角的平分线的尺规作图的课程.小明受此问题启发,利用轴对称性又发现了一种作角平分线的方法(如图).请仔细阅读并完成相应任务.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/3c81f0eb-aef8-46cd-9e88-510f2f448b00.jpg?resizew=157)
【作法】
①以点M为圆心,任意长为半径画弧,交角的两边于点A,B;
②再以点M为圆心,另一个半径长画弧,交角的两边于点C,D;
③连接
,
交于点E;
④作射线
.
射线
即为
的平分线.
【任务】
(1)由尺规作图可直接得到线段相等的有:
和_____.
(2)由(1)中的条件,可证
,依据是______.(填判定方法)
(3)如果把(2)中已得的
作为条件,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/3c81f0eb-aef8-46cd-9e88-510f2f448b00.jpg?resizew=157)
【作法】
①以点M为圆心,任意长为半径画弧,交角的两边于点A,B;
②再以点M为圆心,另一个半径长画弧,交角的两边于点C,D;
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
④作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f9c3b578fc0598d5ec6c79404c6cc2.png)
【任务】
(1)由尺规作图可直接得到线段相等的有:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ecb9581622f4820971cc55f480fa531.png)
(2)由(1)中的条件,可证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26a8d7bb4187b64fb0fd732bee19dd5.png)
(3)如果把(2)中已得的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26a8d7bb4187b64fb0fd732bee19dd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f9a3935cd124d021c7b18b0f634915.png)
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解答题-证明题
|
适中
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【推荐1】如图,平行四边形
的对角线
、
交于点
,分别过点
、
作
,
,连接
交
于点
.
;
(2)当
时,判断四边形
的形状?并说明理由.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4ed367926376b17f6bef079644ea79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6a04b6b10b8b2788f026b95ce367d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddc02b9be6664657ed53679592334d9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d000a9d441370a43debf5845f5f41142.png)
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解答题-证明题
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【推荐2】已知:点P是平行四边形
对角线
所在直线上的一个动点(点
不与点A、C重合),分别过点A、C向直线
作垂线,垂足分别为点E、F,点O为
的中点.
(1)当点
与点
重合时如图1,易证
(不需证明)
(2)直线
绕点
逆时针方向旋转,当
时,如图2的位置,猜想线段
之间有怎样的数量关系?请写出你对图2的猜想并证明.
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/a83719c9-d7a5-478c-b5f5-81ccf648d2af.png?resizew=309)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2e3236ea30ee2c37928b98041f13a.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b8c1c5ab3096de8b594b59d114268b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ae54127b16ef5ea9dd48ad90a223e7.png)
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解答题-证明题
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【推荐1】如图,四边形
中,
,且
,
、
分别是
、
的中点,
与
相交于点
.
![](https://img.xkw.com/dksih/QBM/2022/12/23/3136977577492480/3161110714089472/STEM/5fb626ccf17d4758a0b8b2de86edfa8c.png?resizew=152)
(1)求证:
;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12143a06ed24558d8cc7ad39961d3e1f.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2022/12/23/3136977577492480/3161110714089472/STEM/5fb626ccf17d4758a0b8b2de86edfa8c.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/400159b4bacb3cb40bc0bc4abcbb3842.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3291e1c412a2adb49d3cb760b108dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
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解答题-作图题
|
适中
(0.65)
名校
【推荐2】如图,在平行四边形
中,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/c80458cc-d98e-4435-84e7-e212799de64a.png?resizew=174)
(1)实践与操作:作
的平分线交
于点
,在
上截取
,连接
.(要求:尺规作图,保留作图痕迹,不写作法)
(2)求证:四边形
是菱形.(在下列横线上补全推理过程或推理依据)
证明:四边形
是平行四边形,
∴
,
∴ ① ,( ② )
∵
平分
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb88f0386fc3ae7d108e79305e2e712f.png)
∴ ③
④
由(1)得:
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/027f82d255ca6058000c9683a6cffd7b.png)
又∵ ⑤
∴四边形
是平行四边形,( ⑥ )
∵ ⑦
∴四边形
是菱形.( ⑧ )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6694f3443cc5f4d09948679251b61.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/c80458cc-d98e-4435-84e7-e212799de64a.png?resizew=174)
(1)实践与操作:作
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14833dbeed409b33acd4c9071fd0be36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
证明:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
∴ ① ,( ② )
∵
![](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/fb88f0386fc3ae7d108e79305e2e712f.png)
∴ ③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3006396a74ac1f3da6243cdf180e51.png)
由(1)得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14833dbeed409b33acd4c9071fd0be36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/027f82d255ca6058000c9683a6cffd7b.png)
又∵ ⑤
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
∵ ⑦
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,点E,F在对角线
上,且
.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/18cdea14-386d-492d-80fa-d742c417a70c.png?resizew=197)
(1)
;
(2)若四边形
是菱形,求证四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/18cdea14-386d-492d-80fa-d742c417a70c.png?resizew=197)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3c15b30bd155641e548a7d8c172dd4.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在平行四边形
中,过点A作
于点E,
于点F,且
.
(1)求证:平行四边形
是菱形
(2)若
,
,求菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f8812702659c9e5308541bd53ada2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/17/8a6d5054-34bb-4409-85f7-965be48a74ea.png?resizew=155)
(1)求证:平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93bc4c9dd737193f7acce692b23500d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次