如图,在
中,
,
平分
交AC于点D,过点D作
交
于点E,
交
于点F,连接
.
(1)判断:四边形
是什么特殊的四边形,并说明理由;
(2)若
求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cad97dd9d9593fa01342550aba6ec47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/25/3d2d937c-289b-4ecc-b922-95f09b5e6a71.png?resizew=140)
(1)判断:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87e1fe20bb0e8292e993657e14bc79a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cfd614f695eea9460c160fe0eec837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
更新时间:2023-07-21 16:09:00
|
相似题推荐
解答题-计算题
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【推荐1】阅读下面材料:
小石遇到这样一个问题:图1,
分别是
的边
上的动点(不与点B重合),
与
的角平分线交于点P,
的周长为a,过点P作
于点
于点N,求
与
的周长a的数量关系.
小石通过测量发现了垂线段
与
的数量关系,从而构造全等三角形和直角三角形,经过推理和计算使问题得解决.
(1)线段
与
的数量关系为__________;
与a的数量关系是____________.
(2)如图2,当
时,其它条件不变,判断点P到
的距离
与
的周长a的数量关系,并简要说明理由.
小石遇到这样一个问题:图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5fdbfd4a1c3c268135c76036aa4c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50b5e3233c752c038002943d888cc71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d3f1c7f7ffdf572978468d5a3adde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0eb7bc13f6f2e3f2de6ecf7c01a8981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f3a10030479306664e8ac3306d3600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bb1548ddc0e5536a35b1bd78c4e7cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
小石通过测量发现了垂线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bb1548ddc0e5536a35b1bd78c4e7cd.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://img.xkw.com/dksih/QBM/2021/4/29/2710114436521984/2710166847299584/STEM/b1d3e345-37e6-4666-8bdb-31c0ae33995f.png)
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名校
【推荐2】如图,已知
是
的平分线,交
于点F,D、E、G分别是
、
、
上的点,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3e9af77ba220f7fbc983ba79dd40483.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/30/2295ab95-313c-4310-b214-bb51c061ecb0.png?resizew=157)
(1)图中
与
是一对__________,
与
是一对__________,
与
是一对________.(填“同位角”或“内错角”或“同旁内角”)
(2)判断
与
是什么位置关系?说明理由;
(3)若
,垂足为F,
,求
的度数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/377f663e618d73d87a52f360aa02e386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3e9af77ba220f7fbc983ba79dd40483.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/30/2295ab95-313c-4310-b214-bb51c061ecb0.png?resizew=157)
(1)图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605f2976297a0deaa1602ef09d6a5afa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88047dcb878ed16f6ba458406817e70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605f2976297a0deaa1602ef09d6a5afa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4c3c0a34dc21292fa32befd58d8f82.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e68633cbbe3cc2d0801305f81a7aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98361cbdf0fe01ddbf277493253ef12b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
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解答题-证明题
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【推荐1】已知:如图,
是
的角平分线,
交
于点E,
交
于点F.
是菱形;
(2)若
,
,试求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca14fa885a9d04f04e0418b49b118241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100b3e7dcd5f34c5234971cd75bff138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa428ad86aaaa99629aac86c0ff6a25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf05aaa351239448a9ab0e048f76faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
您最近一年使用:0次
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【推荐2】如图,在直角坐标系中,点A、B的坐标分别为
和
,点C是y轴上的一个动点,且A、B、C三点不在同一条直线上.
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847664686718976/2901952209084416/STEM/a548d0b6-005c-49d8-9ea6-5b4dacbf617c.png?resizew=171)
(1)求出
的长.
(2)求出
的周长的最小值?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69abe959988e4c8c0739f5857ccfb0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c3a2f5b0702ea9fbb9dc8904579737.png)
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847664686718976/2901952209084416/STEM/a548d0b6-005c-49d8-9ea6-5b4dacbf617c.png?resizew=171)
(1)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-作图题
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【推荐1】数学活动课上,陈老师布置了一道题目:如图,你能用一张锐角三角形纸片ABC折出一个以∠A为内角的菱形吗?
请根据悦悦的折法在图中画出对应的图形,并证明四边形AEDF是菱形.
悦悦的折法如下: 第一步,折出∠A的平分线,交BC于点D. 第二步,折出AD的垂直平分线,分别交AB、AC于点E、F,把纸片展平. 第三步,折出DE、DF,得到四边形AE |
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【推荐2】如图,在四边形ABCD中,点E,F分别在边BC,CD上,连接AE,AF,已知△ABE≌△ADF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/263e82c7-7b3a-41a3-9062-062c9742726e.png?resizew=234)
(1)若AD
BC,求证:四边形ABCD是菱形;
(2)以下条件:①∠BAD=∠BCD;②AB=CD;③BC=CD.如果用其中的一个替换(1)中的“AD
BC”,也可以证明四边形ABCD是菱形,那么可以选择的条件是 (填写满足要求的所有条件的序号).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/263e82c7-7b3a-41a3-9062-062c9742726e.png?resizew=234)
(1)若AD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)以下条件:①∠BAD=∠BCD;②AB=CD;③BC=CD.如果用其中的一个替换(1)中的“AD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
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