如图,在
ABC中,∠ABC=60°,点D,E分别为AB,BC上一点,BD=BE,连接DE,DC,AC=CD.
(1)如图1,若AC=3
,DE=2
,求EC的长;
(2)如图2,连接AE交DC于点F,点M为EC上一点,连接AM交DC于点N,若AE=AM,求证:2DE=MC;
(3)在(2)的条件下,若∠ACB=45°,直接写出线段AD,MC,AC的等量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)如图1,若AC=3
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)如图2,连接AE交DC于点F,点M为EC上一点,连接AM交DC于点N,若AE=AM,求证:2DE=MC;
(3)在(2)的条件下,若∠ACB=45°,直接写出线段AD,MC,AC的等量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/5037351a-33c9-4490-a146-5d833a0a6dae.png?resizew=528)
更新时间:2020-07-11 17:24:56
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相似题推荐
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【推荐1】如图,将▱ABCD的边DC延长至点E,使
,连结AE,交BC于点F.
求证:
≌
;
连结AC,BE,若四边形ABEC是菱形,且
,
,求AD的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7179f9d3f94408586b481f7e38dbb9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27ac7353dc499536c52a2aa669a212a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4073a67f798a8db853cc6b13f4ad54cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e48cb97030ade55c26abca13aa73b19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d310134e0f04c5262f99810e9df21ac7.png)
![](https://img.xkw.com/dksih/QBM/2018/8/21/2015363522560000/2017472125952000/STEM/fb428e395127432684b0e8ec1d7f707f.png?resizew=140)
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【推荐2】【问题初探】(1)如图1,四边形
中,
,
,
,
,
分别是
,
上的点,且
,试判断
,
,
之间的关系.聪明的小明是这样做的:延长
到点
,使
,连接
,先证明
,再证
,故
,
,
之间的数量关系为 .
【类比探究】(2)如图2在四边形
中,
,
,
,点
,
分别在四边形
的边
,
的延长线上,
,连接
,请根据小明的发现给你的启示写出
,
,
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21eb847a1722ed6e10e23c59d53fe7d3.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc180eda08edfb6d54eb04da7741f099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac09e961b25848c2860065aa8f577e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94cb21b1fcfa6e188e0ba5161edd1c92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
【类比探究】(2)如图2在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21eb847a1722ed6e10e23c59d53fe7d3.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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1】如图1,在△ABC中,点P为BC边上一点,设BP=x,AP2=y,已知y是x的二次函数的一部分,其图象如图2,点Q(2,12)是图象上的最低点,且图象与y轴交于(0,16).
(1)求y关于x的函数解析式;
(2)当△ABP为直角三角形时,BP的值是多少?
(1)求y关于x的函数解析式;
(2)当△ABP为直角三角形时,BP的值是多少?
![](https://img.xkw.com/dksih/QBM/2019/12/8/2350590034567168/2351458004844544/STEM/a8f6102cedc142b78227a2cfb4f55b6d.png?resizew=403)
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【推荐2】如图,已知
,
,
,斜边
,
为
垂直平分线,且
,连接
,
.
![](https://img.xkw.com/dksih/QBM/2020/1/27/2386259926654976/2386971193999360/STEM/61800d68-e244-49c4-9cc8-26731714c3fd.png?resizew=165)
(1)直接写出
__________,
__________;
(2)求证:
是等边三角形;
(3)如图,连接
,作
,垂足为点
,直接写出
的长;
![](https://img.xkw.com/dksih/QBM/2020/1/27/2386259926654976/2386971193999360/STEM/7685e3e5-7b24-4cbc-9723-f4a60fbb46cd.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2020/1/27/2386259926654976/2386971193999360/STEM/5ed971b3-c16e-4826-a568-99c9cffe73dc.png?resizew=169)
(4)
是直线
上的一点,且
,连接
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87fd28b8b2bde9de5630a6106a6f762e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5490dba7da9a3f60c2f9440b2ddd0162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://img.xkw.com/dksih/QBM/2020/1/27/2386259926654976/2386971193999360/STEM/61800d68-e244-49c4-9cc8-26731714c3fd.png?resizew=165)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
(3)如图,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ff7bf8ffc8a04186e3e13c1a6d5ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2020/1/27/2386259926654976/2386971193999360/STEM/7685e3e5-7b24-4cbc-9723-f4a60fbb46cd.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2020/1/27/2386259926654976/2386971193999360/STEM/5ed971b3-c16e-4826-a568-99c9cffe73dc.png?resizew=169)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9ecbea8e9af87eb2cdb5b3c72fd926.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
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【推荐1】如图,AB是⊙O的直径,P为AB上一点,弦CD与弦EF交于点P,PB平分∠DPF,连DF交AB于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/0a0dcfb5-640a-4e47-97c0-315ff0e02c1e.png?resizew=142)
(1)求证:CD=EF;
(2)若∠DPF=60°,PE∶PF=1∶3,AB=2
,求OG的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/0a0dcfb5-640a-4e47-97c0-315ff0e02c1e.png?resizew=142)
(1)求证:CD=EF;
(2)若∠DPF=60°,PE∶PF=1∶3,AB=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50690dab38f4512eb72e18b7f86cf6f6.png)
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【推荐2】问题探究
(1)如图1,
中,
,
,将
绕点
逆时针旋转得到
,点
的对应点
落在
边上,
,连接
,则
的长为_______;
(2)如图2,在
中,
,
为
边上的高,若
,试判断
的面积是否存在最小值?若存在,请求出最小值;若不存在,请说明理由;
![](https://img.xkw.com/dksih/QBM/2022/4/5/2951515022680064/2973512397709312/STEM/6581df5c-62d2-4d6f-a1e2-40af4174110d.png?resizew=505)
问题解决
(3)如图3,
是某植物园的花卉展示区的部分平面示意图,其中
,
,
边上的点
为休息区,
米,
米,两条观光小路
和
(小路宽度不计,
在
边上,
在
边上)拟将这个展示区分成三个区域,用来展示不同的花卉,根据实际需要,
,并且要求四边形
的面积尽可能大,那么是否存在满足条件的四边形
?若存在,请求出四边形
的面积的最大值;若不存在,请说明理由.(结果保留根号)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36daf61acd400b4a685d34f1bd878144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3557809c066e68395b614535a7675e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/401c99054d449d1bda2db95d4c2e7cbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24963d5acbbdcd6e15c2db04002e0909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24963d5acbbdcd6e15c2db04002e0909.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7978151ee28b5d0b797786526d303d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2022/4/5/2951515022680064/2973512397709312/STEM/6581df5c-62d2-4d6f-a1e2-40af4174110d.png?resizew=505)
问题解决
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9357c771dff40c958245533da1d3c1c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662a9a633cdf3c5f19105025d69fc089.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d8c02792e38156910df7ca5b6e8cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea384826175316e3c89f68abd8e2ee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea384826175316e3c89f68abd8e2ee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea384826175316e3c89f68abd8e2ee1.png)
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【推荐1】【模型建立】
(1)如图1,
和
都是等边三角形,点
关于
的对称点
在
边上.
①求证:
;
②用等式写出线段
,
,
的数量关系,并说明理由.
【模型应用】
(2)如图2,
是直角三角形,
,
,垂足为
,点
关于
的对称点
在
边上.用等式写出线段
,
,
的数量关系,并说明理由.
【模型迁移】
(3)在(2)的条件下,若
,
,求
的值.
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
②用等式写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
【模型应用】
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c90da0cd2708481057fe19acebf2ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
【模型迁移】
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97be8206012b8d5b1402dfa5e9761196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7e75d7342e6f087370d09181b17a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca181682306cde7908ef6e7bf9fcd00.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐2】现有五个边长都为4cm的小正方形硬纸板,若将这五个小正方形硬纸板按如图方法不重叠地放在桌面上,再用一个圆形硬纸板将其盖住.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/c9e72223-c09c-4f73-8ed2-40fd7a543213.png?resizew=553)
(1)如图4,能盖住图1中五个小正方形所需的圆形硬纸板最小直径应为 cm;
(2)如图5,能盖住图2中五个小正方形所需的圆形硬纸板最小直径应为 cm;
(3)在图3中,请用直尺、圆规作出能盖住这五个小正方形的最小圆(不写作法,保留作图痕迹),并求出圆的直径.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/c9e72223-c09c-4f73-8ed2-40fd7a543213.png?resizew=553)
(1)如图4,能盖住图1中五个小正方形所需的圆形硬纸板最小直径应为 cm;
(2)如图5,能盖住图2中五个小正方形所需的圆形硬纸板最小直径应为 cm;
(3)在图3中,请用直尺、圆规作出能盖住这五个小正方形的最小圆(不写作法,保留作图痕迹),并求出圆的直径.
您最近一年使用:0次