如图:五边形ABCDE中,AB∥CD,BC⊥AB,AB=BC=8,CD=5.
(1)说明∠A,∠E,∠D之间的数量关系;
(2)平移五边形ABCDE,使D点移动到C点,画出平移后的五边形A'B'C'CE',并求出顺次连接A、A'、E'、C、D、E、A各点所围成的图形的面积;
(3)在∠BAE和∠E'CD的内部取一点F,使∠EAF=
∠EAB,∠FCE'=
∠DCE' ,求∠AFC与∠AED之间的数量关系.
(1)说明∠A,∠E,∠D之间的数量关系;
(2)平移五边形ABCDE,使D点移动到C点,画出平移后的五边形A'B'C'CE',并求出顺次连接A、A'、E'、C、D、E、A各点所围成的图形的面积;
(3)在∠BAE和∠E'CD的内部取一点F,使∠EAF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170443475959808/null/STEM/bceb52795c474ec4924178c8086537e7.png?resizew=156)
更新时间:2019-03-31 11:07:59
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相似题推荐
解答题-问答题
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【推荐1】如图,四边形
,
、
分别平分四边形的外角
和
,若
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/51f62d4c-f2cd-41c9-beee-9b0e58cfb2ba.png?resizew=382)
(1)如图
,若
,求
的度数;
(2)如图
,试说明:
的度数与
,
的数量关系.
(3)如图
,若
与
相交于点
,
,请写出
、
所满足的等量关系式;
(4)如图
,若
,判断
、
的位置关系,并说明理由.
![](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/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91471da4a77df63164169d4858666563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79753e37f80ddd2e77048341f599c46f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/224efa375375f1ac848b0c15ee51aebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ea718698b44ab67a5dac6206e54f0d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/51f62d4c-f2cd-41c9-beee-9b0e58cfb2ba.png?resizew=382)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd39d96d8e5e929cd9b85245a752fbe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/972aad636c69b7f8f770d1fad75b3713.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/972aad636c69b7f8f770d1fad75b3713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(4)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa3205b1df826d63914dcb55bb3ab43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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【推荐2】义:有两个相邻内角和等于另两个内角和的一半的四边形称为半四边形,这两个角的夹边称为对半线.
(1)如图1,在对半四边形ABCD中,∠A+∠B=
(∠C+∠D),求∠A与∠B的度数之和;
(2)如图2,O为锐角△ABC的外心,过点O的直线交AC,BC于点D,E,∠OAB=30°,求证:四边形ABED是对半四边形;
(3)如图3,在△ABC中,D,E分别是AC,BC上一点,CD=CE=3,CE=3EB,F为DE的中点,∠AFB=120°,当AB为对半四边形ABED的对半线时,求AC的长.
(1)如图1,在对半四边形ABCD中,∠A+∠B=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)如图2,O为锐角△ABC的外心,过点O的直线交AC,BC于点D,E,∠OAB=30°,求证:四边形ABED是对半四边形;
(3)如图3,在△ABC中,D,E分别是AC,BC上一点,CD=CE=3,CE=3EB,F为DE的中点,∠AFB=120°,当AB为对半四边形ABED的对半线时,求AC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/e5c60cb4-d1b1-4160-b27d-01d140272a51.png?resizew=525)
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【推荐1】如图,在平面直角坐标系
中,直线
:
交x轴于点A,交y轴于点B,一次函数:
的图象交x轴于点C,交y轴于点D,与直线
交于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/5219812a-5f19-4090-a84b-5ecff6c4de65.png?resizew=640)
(1)当
,
时,求点P的坐标,,并求
的度数;
(2)若四边形
的面积是
,且
,试求点P的坐标及直线
的关系式;
(3)如图2,在(2)的条件下,将直线
向下平移9个单位得到直线
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交y轴于点M,交x轴于点N,若点E为射线
上一动点,连接
,在坐标轴上是否存在点F,使
是以
为底边的等腰直角三角形,直角顶点为F.若存在,请求出点F的坐标;若不存在,请说明理由.
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/5219812a-5f19-4090-a84b-5ecff6c4de65.png?resizew=640)
(1)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be604061cf1591f7069472269d4c9719.png)
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(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ffc12a92b91c55299a3f88668b83b2c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(3)如图2,在(2)的条件下,将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐2】如图1,正方形
的边长为4,点
是对角线
上两动点,且
,将点
沿
的方向平移2个单位得到点
,连接
、
.
的形状为_____________;
②连接
、
,当点
,
,
共线时,
的值为_____________.
(2)自古以来,黄河就享有“母亲河”的美誉,是中华文明的发源地之一,也是中华民族生生不息、赖以生存的摇篮.如图2,某地黄河的一段出现了分叉,形成了“
”字型支流,分叉口有一片三角形地带的湿地,在支流1的左上方有一村庄
,支流2的右下方有一开发区
,为促进当地的经济发展,经政府决定在支流1和支流2上分别修建一座桥梁
、
(支流1的两岸互相平行,支流2的两岸也互相平行,桥梁均与河岸垂直),你能帮助政府计算一下由村庄
到开发区
理论上的最短路程吗?(即
和的最小值).经测量,
、
两地的直线距离为2000米,支流1、支流2的宽度分别为
米、250米,且与线段
所夹的锐角分别为
、
.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77f15bb171b383aa2f10459b18e636ab.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac175010746fd4c90a55cb9081a1ffb6.png)
(2)自古以来,黄河就享有“母亲河”的美誉,是中华文明的发源地之一,也是中华民族生生不息、赖以生存的摇篮.如图2,某地黄河的一段出现了分叉,形成了“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
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