在正方形
中,线段
交对角线
于点G.
(1)如图1,若点E、F分别在
、
边上,且
,求证:
;
(2)如图2,若点E在
边上,点F在
边的延长线上,且
.(1)中结论是否依然成立?请说明理由;
(3)在(2)的条件下,连接
并延长交
于点H,若
,
.求正方形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/12/bfd8cb64-62c4-4185-b54a-a2caf1c154fa.png?resizew=533)
(1)如图1,若点E、F分别在
![](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/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/690c06742fc47007c6a078ede7ecabf6.png)
(2)如图2,若点E在
![](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/d8ce1475f537b4ad21775bfaa16daa0c.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fe49abfd436a012126ca65b63be66c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
更新时间:2023-07-07 12:05:00
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解答题-证明题
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【推荐1】正方形ABCD边长为6,点E在边AB上(点E与点A、B不重合),点F、G分别在边BC、AD上(点F与点B、C不重合),直线FG与DE相交于点H.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901508412833792/2902204857237504/STEM/80df5f88bd2e4fe19edf450b060673ab.png?resizew=550)
(1)如图1,若∠GHD=90°,求证:GF=DE;
(2)在(1)的条件下,平移直线FG,使点G与点A重合,如图2.联结DF、EF.设CF=x,△DEF的面积为y,用含x的代数式表示y;
(3)如图3,若∠GHD=45°,且BE=2AE,求FG的长.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901508412833792/2902204857237504/STEM/80df5f88bd2e4fe19edf450b060673ab.png?resizew=550)
(1)如图1,若∠GHD=90°,求证:GF=DE;
(2)在(1)的条件下,平移直线FG,使点G与点A重合,如图2.联结DF、EF.设CF=x,△DEF的面积为y,用含x的代数式表示y;
(3)如图3,若∠GHD=45°,且BE=2AE,求FG的长.
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【推荐2】如图,在平行四边形ABCD中,点E在边BC上,连结AE,EM⊥AE,垂足为E,交CD于点M,AF⊥BC,垂足为F,BH⊥AE,垂足为H,交AF于点N,点P显AD上一点,连接CP.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/754eff44-ac49-4e2a-8987-9c237b0d602f.png?resizew=301)
(1)若DP=2AP=4,CP=
,CD=5,求△ACD的面积.
(2)若AE=BN,AN=CE,求证:AD=
CM+2CE.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/754eff44-ac49-4e2a-8987-9c237b0d602f.png?resizew=301)
(1)若DP=2AP=4,CP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20838e72faf737614d76fcee82ab6c5.png)
(2)若AE=BN,AN=CE,求证:AD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐1】如图,在平行四边形ABCD中,两条对角线相交于点O,EF经过点O且垂直于AC,分别与边AD,BC交于点F,E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/87b098d4-2d60-48bd-aeea-8557f7775820.png?resizew=199)
(1)求证:四边形AECF为菱形;
(2)若AD=3,CD
,且∠ADC=45°,直接写出四边形AECF的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/87b098d4-2d60-48bd-aeea-8557f7775820.png?resizew=199)
(1)求证:四边形AECF为菱形;
(2)若AD=3,CD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae65bdb69940a67a18d56ff02060b22.png)
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【推荐2】如图,在正方形ABCD中,
,E为BD上的动点,连接AE并延长交正方形ABCD的边于点F,将AF绕点A逆时针旋转90°得到AG,点E的对应点为点H.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/29/61a82ad8-52fb-4e22-a5df-8b69c57514b8.png?resizew=326)
(1)连接DH,求证:
;
(2)当
时,求BF的长;
(3)连接BH,请直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/29/61a82ad8-52fb-4e22-a5df-8b69c57514b8.png?resizew=326)
(1)连接DH,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf948c913f56dda865a4227be0cc6970.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87f9586b708869fd7186e75a75c1dcf.png)
(3)连接BH,请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ce2ca1e1ce11cd37a3c22b985992a2e.png)
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【推荐1】在正方形
中,过点A引射线
,交边
于点H(H不与点D重合).通过翻折,使点B落在射线
上的点G处,折痕
交
于E,连接E,G并延长
交
于F.
(1)如图1,当点H与点C重合时,
与
的大小关系是_________;
是____________三角形.
(2)如图2,当点H为边
上任意一点时(点H与点C不重合).连接
,猜想
与
的大小关系,并证明你的结论.
(3)在图2,当
,
时,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)如图1,当点H与点C重合时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e4643ee6debb99d9a9d00eb83ee1aca.png)
(2)如图2,当点H为边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
(3)在图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca1afb3915b4e110c916a91b3188270.png)
![](https://img.xkw.com/dksih/QBM/2019/7/15/2247262662230016/2247305579429888/STEM/6a3be3d331d741c5807353906370110c.png?resizew=184)
![](https://img.xkw.com/dksih/QBM/2019/7/15/2247262662230016/2247305579429888/STEM/5c2ef855c84f4218b7cb06a2aed6e686.png?resizew=161)
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解题方法
【推荐2】如图
,点
是正方形
的边
上的任意一点(不与
、
重合),
与正方形的外角
的角平分线交于点
.
.
(2)将图
放在平面直角坐标系中,如图
,连
、
,
与
交于点
,若正方形
的边长为
,则四边形
的面积是否随
点位置的变化而变化?若不变,请求出四边形
的面积.
(3)在的(2)条件下,若
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a19339adac3a2f1aab1fbc11b1c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7a82bf203df79ba6c0ef80026198d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
(2)将图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85719346f464a101d365d42be27450a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85719346f464a101d365d42be27450a3.png)
(3)在的(2)条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30e504f73ea4dd06060d371728587b97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb9feb0425391b46bf7a65a4aff0de1.png)
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【推荐3】“构造图形解题”,它的应用十分广泛,特别是有些技巧性很强的题目,如果不能发现题目中所隐含的几何意义,而用通常的代数方法去思考,经常让我们手足无措,难以下手,这时,如果能转换思维,发现题目中隐含的几何条件,通过构造适合的几何图形,将会得到事半功倍的效果,下面介绍两则实例:
实例一:1876年,美国总统伽非尔德利用实例一图证明了勾股定理:由
S四边形ABCD=S△ABC+S△ADE+S△ABE得
,化简得:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3133ef62aad6bdd6637140620f068fad.png)
实例二:欧几里得的《几何原本》记载,关于x的方程
的图解法是:
画Rt△ABC,使∠ABC=90°,BC=
,AC=
,再在斜边AB上截取BD=
,则AD的长就是该方程的一个正根(如实例二图)
请根据以上阅读材料回答下面的问题:
(1)如图1,请利用图形中面积的等量关系,写出甲图要证明的数学公式是 ,乙图要证明的数学公式是
(2)如图2,若2和-8是关于x的方程x2+6x=16的两个根,按照实例二的方式构造Rt△ABC,连接CD,求CD的长;
(3)若x,y,z都为正数,且x2+y2=z2,请用构造图形的方法求
的最大值.
实例一:1876年,美国总统伽非尔德利用实例一图证明了勾股定理:由
S四边形ABCD=S△ABC+S△ADE+S△ABE得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/165ec7b6a2b621bc44feebc80b7cad3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3133ef62aad6bdd6637140620f068fad.png)
实例二:欧几里得的《几何原本》记载,关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf24c99b9ad5ea45b0e584c92334d4d.png)
画Rt△ABC,使∠ABC=90°,BC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/576833b76e9cad3b523f87132308df99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce22731a412796fe2925e01f765d5976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/576833b76e9cad3b523f87132308df99.png)
请根据以上阅读材料回答下面的问题:
(1)如图1,请利用图形中面积的等量关系,写出甲图要证明的数学公式是 ,乙图要证明的数学公式是
(2)如图2,若2和-8是关于x的方程x2+6x=16的两个根,按照实例二的方式构造Rt△ABC,连接CD,求CD的长;
(3)若x,y,z都为正数,且x2+y2=z2,请用构造图形的方法求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180f65360e4cbdb99388cdfe2816c6ba.png)
![](https://img.xkw.com/dksih/QBM/2020/5/11/2460533462335488/2461175508770816/STEM/26660e232d074a97b679bce480a933bc.png?resizew=385)
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【推荐1】【问题发现】
(1)如图①,在正方形
中,
是
上一点(点
与
,
不重合),
交
于点
,
交
于点
.试猜想线段
,
和
之间的数量关系,并证明;
【延伸探究】
(2)在其余条件不变的基础上延长
,交
于点
,连接
,
,交于点
,如图②.求证:
;
【问题解决】
(3)如图③,是一块边长为
米的正方形钢板
由于磨损,该钢板的顶点
,
,
均不能使用,王师傅计划过点
裁出一个形如四边形
的零件,其中点
,
,
分别在
,
,
边上,且
为
的中点,
交
于点
,连接
,求王师傅能裁出四边形
的最大面积是多少?
(1)如图①,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/119e066d5bc6229d203536a09e55ced7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4d11045e757d8ab8fc43dacfb4cce29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
【延伸探究】
(2)在其余条件不变的基础上延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f31f9e579357b745ff51cae0176fe65.png)
【问题解决】
(3)如图③,是一块边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5bfd7f1fdb00baaaaddfc27ad9a24c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72794bd3cbe1a898e2254c3dd98a437e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/a0dc801d1472bc00cf030c3397428418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72794bd3cbe1a898e2254c3dd98a437e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/a89f3569-81fa-4e17-baaf-057803eaa4ef.png?resizew=441)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐2】如图所示,在正方形
中,
是边
上的一动点(不与点B、C重合),连接
,点
关于直线
的对称点为
,连接
并延长交直线
于点G,F是
的中点,连接
,依题意补全图形.
![](https://img.xkw.com/dksih/QBM/2022/12/7/3125712014532608/3129483164237824/STEM/d869bf8aa2e34130b508cb4d18ba935d.png?resizew=202)
(1)请直接写出
的度数;
(2)连接
,请用等式表示
、
、
三条线段之间的数量关系,并证明;
(3)连接
,若正方形
的边长为4,请直接写出
的面积最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da650ee630c36fd5ce9abb4fb826df7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da650ee630c36fd5ce9abb4fb826df7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/2022/12/7/3125712014532608/3129483164237824/STEM/d869bf8aa2e34130b508cb4d18ba935d.png?resizew=202)
(1)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f9f70b2bf8747fb27c7ca1ae7cdea4.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da4262e81db56e4d64a2fc41663f20f5.png)
您最近一年使用:0次