如图,在
中,
,垂足分别为
,四边形
是平行四边形吗?为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92288eda5fecea1498910f7684c78813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://img.xkw.com/dksih/QBM/2023/1/6/3147049316818944/3148361349832704/STEM/aec88aab855841d59dd7fcaa3a4162ad.png?resizew=191)
更新时间:2023-01-08 13:40:28
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相似题推荐
解答题-证明题
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真题
名校
【推荐1】在Rt△ABC中,∠BAC=90°,D是BC的中点,E是AD的中点.过点A作AF∥BC交BE的延长线于点F.
(2)证明四边形ADCF是菱形;
(3)若AC=4,AB=5,求菱形ADCF 的面积.
(2)证明四边形ADCF是菱形;
(3)若AC=4,AB=5,求菱形ADCF 的面积.
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【推荐2】材料阅读:“对称补缺”是解决与轴对称图形有关问题的一种添加辅助线的常用策略.例如图
,
中,
是
的平分线,
交
的延长线于点
.如图
,延长
、
交于点
,即可构造出轴对称图形
,进而得到边、角之间特殊的数量关系,为解决问题提供思路.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/99109c7d-08ab-45a1-acf7-7c43c8b4fbb8.png?resizew=427)
迁移应用:
如图
,
中,若
,
,
是
的角平分线交
于点
,
垂足为点
.若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0e65e147b109f2bbfd3a3f502bbc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795bf655eff5c8d072b4d4757ba2166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0e65e147b109f2bbfd3a3f502bbc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4cb4069a2e1e90d1a9c4979ad09ca2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb961bd7db3adb76af2d4cedb611bd7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/99109c7d-08ab-45a1-acf7-7c43c8b4fbb8.png?resizew=427)
迁移应用:
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b44fa421d3ab01eee0d360a503bd212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21bdf07d26cca2c138d40e3b8353c5a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5efdefad9466c322b007a7a72de0497.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
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解答题-作图题
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名校
【推荐1】如图,四边形
是平行四边形,
是对角线.
的下方作射线
,使
,射线
分别交
于点
,交
的延长线于点
,连接
.(只保留作图痕迹)
(2)在(1)所作的图形中,证明:
,(请完成下面的填空)
四边形
是平行四边形,
① ,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
,
② .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
,
③ ,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
,④
⑤
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c91f72251d43a5c03587f93ae284e3af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)在(1)所作的图形中,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.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/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf0f1165b2b24cea8c64ac5e392879d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb663fe83b1f7e93e13d91cc6460f9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b05f108908706f67e7d060a214a86c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be3164fc840ff66e44ac6b34f24a6065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b04b73200fbec6a89974c251d680494.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f4dcea7b3fbf9e02745a749d8c08e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
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【推荐2】问题提出
(1)如图1,
是
高,且
,则
是___________三角形.
问题探究
(2)如图2,在
中,
是
的中点,延长
交
的延长线于点
.求证:
.
问题解决
(3)如图3,现有一块
型板材,
为
边上的中点,工人师傅要在这块板材开出一个
型凹槽,并要求
,若
,求
的长度.
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
问题探究
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5046750cc3ea6fd087a257928e05b35.png)
问题解决
(3)如图3,现有一块
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d972e0f89d8353f387eda3e299d6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e87d83f28543ca0b9f47e435213afd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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解答题-证明题
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【推荐1】如图1,在菱形
中,
,
,点E是
边上一动点,点F是
边上一动点.
(1)①
②
③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4dab208135f292fe1a917133d9afb1.png)
从上述三个选项中选一个作为条件,另一个作为结论,得到一个真命题,并证明你选择的条件是_________,结论是_________.(填序号)
(2)如图2,试仅用一把无刻度的直尺,在边
上找一点G,在边
上找一点H,使得四边形
是平行四边形.(保留痕迹,不写作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/8/f0cb3ab1-23a8-45e4-aabb-849b60003244.jpg?resizew=326)
(1)①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff56ea00ca90825f3d95809de24f639.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11872bd228050e0af8764dfa77394341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4dab208135f292fe1a917133d9afb1.png)
从上述三个选项中选一个作为条件,另一个作为结论,得到一个真命题,并证明你选择的条件是_________,结论是_________.(填序号)
(2)如图2,试仅用一把无刻度的直尺,在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
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解答题-作图题
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【推荐2】下面是小明设计的“利用已知矩形作一个内角为30°角的平行四边形”的尺规作图过程.
已知:矩形ABCD.
求作:▱AGHD,使∠GAD=30°.
作法:如图,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/b4c10c27-0b27-40eb-beb6-79e0f2256f0f.png?resizew=272)
①分别以A,B为圆心,以大于
AB长为半径,在AB两侧作弧,分别交于点E,F;
②作直线EF;
③以点A为圆心,以AB长为半径作弧,交直线EF于点G,连接AG;
④以点G为圆心,以AD长为半径作弧,交直线EF于点H,连接DH.
则四边形AGHD即为所求作的平行四边形.
根据小明设计的尺规作图过程,填空:
(1)∠BAG的大小为 ;
(2)判定四边形AGHD是平行四边形的依据是 ;
(3)用等式表示平行四边形AGHD的面积S1和矩形ABCD的面积S2的数量关系为 .
已知:矩形ABCD.
求作:▱AGHD,使∠GAD=30°.
作法:如图,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/b4c10c27-0b27-40eb-beb6-79e0f2256f0f.png?resizew=272)
①分别以A,B为圆心,以大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
②作直线EF;
③以点A为圆心,以AB长为半径作弧,交直线EF于点G,连接AG;
④以点G为圆心,以AD长为半径作弧,交直线EF于点H,连接DH.
则四边形AGHD即为所求作的平行四边形.
根据小明设计的尺规作图过程,填空:
(1)∠BAG的大小为 ;
(2)判定四边形AGHD是平行四边形的依据是 ;
(3)用等式表示平行四边形AGHD的面积S1和矩形ABCD的面积S2的数量关系为 .
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