(1)如图,已知,正方形
和正方形
,点G在
边上,点E在
边上,则
与
的数量关系为________;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/8a16cb04-21de-4af3-ba60-de7d7807f91c.png?resizew=137)
(2)将(1)中的正方形
绕点C旋转至下图时,(1)中的结论是否成立?若成立,请给以证明;若不成立,请说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/583680e2-ccb9-4e1f-bdcb-04e06b6d0a76.png?resizew=151)
(3)若
,
,将(1)中正方形
绕点C旋转
度(
),当B,E,G三点在一条直线上时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/8a16cb04-21de-4af3-ba60-de7d7807f91c.png?resizew=137)
(2)将(1)中的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/583680e2-ccb9-4e1f-bdcb-04e06b6d0a76.png?resizew=151)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cefaa03a2be71c9fc509b5b309d1c6ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3acee288e75061ac72203b09fce29904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4238815f530f649275de714b7231f75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/1145af22-ea96-4ae8-834b-45a186c72b28.png?resizew=151)
更新时间:2022-11-11 18:43:15
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
中,点E在
边上,
,将线段
绕点A旋转到
的位置,使得
.连接
,
与
交于点G.
;
(2)若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdf3a515c4ea39c6a0c9c54ed2f6e9c4.png)
![](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/9c2b3d993a79210952ef190542700111.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dab0c0c0f988903f228a6510208420.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a858e3fda1505e5aede22f4d6edd3f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/525da75c1a16bbd786c6ddb43737139d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600f68bbb24b2f34b6f5ebca90939535.png)
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解答题-证明题
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适中
(0.65)
【推荐2】已知:如图,在
中,
,D是
延长线上一点,过点C作
,使
,连结
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/b291cf29-3e83-4df7-a7de-7dd53f428370.png?resizew=163)
(1)求证:
.
(2)求
的度数.
(3)连结
,若
是等腰三角形,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6470a8f2500b3a7ca541a22819bf303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6d946ec5bc75341f7e5fe400054464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b60b1106dab7a5191351381230d90ea8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/b291cf29-3e83-4df7-a7de-7dd53f428370.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
(3)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-问答题
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适中
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【推荐1】如图,在
中,
,点
是直线
上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/6db29491-6d8a-4926-9503-5b967d25320b.png?resizew=360)
(1)如图1,若
,点
是
边的中点,点
是线段
上一动点,求
周长的最小值.
(2)如图2,若
,
,是否存在点
,使以
,
,
为顶点的三角形是等腰三角形,若存在,请直按写出线段
的长度:若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/6db29491-6d8a-4926-9503-5b967d25320b.png?resizew=360)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0570c3dcbb7bd773ffddc7ba1bedfa.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】已知矩形OABC中,OA=3,AB=6,以OA,OC所在的直线为坐标轴,建立如图1的平面直角坐标系.将矩形OABC绕点O顺时针方向旋转,得到矩形ODEF,当点B在直线DE上时,设直线DE和x轴交于点P,与y轴交于点Q.
![](https://img.xkw.com/dksih/QBM/2016/6/21/1574211860561920/1574211866951680/STEM/005800c1732b4c51a3c1f1f3bc5932d8.png?resizew=465)
(1)求证:△BCQ≌△ODQ;
(2)求点P的坐标;
(3)若将矩形OABC向右平移(图2),得到矩形ABCG,设矩形ABCG与矩形ODEF重叠部分的面积为S,OG=x,请直接写出x≤3时,S与x之间的函数关系式,并且写出自变量x的取值范围.
![](https://img.xkw.com/dksih/QBM/2016/6/21/1574211860561920/1574211866951680/STEM/005800c1732b4c51a3c1f1f3bc5932d8.png?resizew=465)
(1)求证:△BCQ≌△ODQ;
(2)求点P的坐标;
(3)若将矩形OABC向右平移(图2),得到矩形ABCG,设矩形ABCG与矩形ODEF重叠部分的面积为S,OG=x,请直接写出x≤3时,S与x之间的函数关系式,并且写出自变量x的取值范围.
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解答题-问答题
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适中
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【推荐1】如图,正方形的剪去四个角后成为一个正八边形.
(1)若正八边形的边长为2,则剪去四个角的面积和为_____;
(2)若正方形的边长为2,求正八边形边长.
(1)若正八边形的边长为2,则剪去四个角的面积和为_____;
(2)若正方形的边长为2,求正八边形边长.
![](https://img.xkw.com/dksih/QBM/2020/3/28/2429101811736576/2433697033199616/STEM/5cd6796b1be14a258fbeea23eac95fc4.png?resizew=86)
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【推荐2】数学活动 黄金矩形
宽与长的比是
(约为0.618)的矩形叫做黄金矩形.黄金矩形给我们以协调、匀称的美感.世界各国许多著名的建筑,为取得最佳的视觉效果,都采用了黄金矩形的设计,如希腊的巴特农神庙(图1)等.
下面我们折叠出一个黄金矩形:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/1f5710a4-afe1-41f7-99e8-591497ab2841.png?resizew=385)
第一步,在一张矩形纸片的一端,利用图2的方法折出一个正方形,然后把纸片展平.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/9298d8f9-717d-4c16-b762-071aeff93e3b.png?resizew=370)
第二步,如图3,把这个正方形折成两个全等的矩形,再把纸片展平.
第三步,折出内侧矩形的对角线AB,并把AB折到图4中所示的AD处.
第四步,展平纸片,按照所得的点D折出DE,矩形BCDE(图5)就是黄金矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/da4722b8-3340-44e5-8b70-a23457fc7b57.png?resizew=361)
(1)请说明矩形BCDE是黄金矩形的理由.
(2)请直接判断图5中矩形MNDE是不是黄金矩形,不需要说明理由.
宽与长的比是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
下面我们折叠出一个黄金矩形:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/1f5710a4-afe1-41f7-99e8-591497ab2841.png?resizew=385)
第一步,在一张矩形纸片的一端,利用图2的方法折出一个正方形,然后把纸片展平.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/9298d8f9-717d-4c16-b762-071aeff93e3b.png?resizew=370)
第二步,如图3,把这个正方形折成两个全等的矩形,再把纸片展平.
第三步,折出内侧矩形的对角线AB,并把AB折到图4中所示的AD处.
第四步,展平纸片,按照所得的点D折出DE,矩形BCDE(图5)就是黄金矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/da4722b8-3340-44e5-8b70-a23457fc7b57.png?resizew=361)
(1)请说明矩形BCDE是黄金矩形的理由.
(2)请直接判断图5中矩形MNDE是不是黄金矩形,不需要说明理由.
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【推荐1】【阅读理解】如图①,l1∥l2,△ABC的面积与△DBC的面积相等吗?为什么?
【类比探究】如图②,在正方形ABCD的右侧作等腰△CDE,CE=DE,AD=4,连接AE,求△ADE的面积.
【拓展应用】如图③,在正方形ABCD的右侧作正方形CEFG,点B,C,E在同一直线上,AD=4,连接BD,BF,DF,直接写出△BDF的面积.
【类比探究】如图②,在正方形ABCD的右侧作等腰△CDE,CE=DE,AD=4,连接AE,求△ADE的面积.
【拓展应用】如图③,在正方形ABCD的右侧作正方形CEFG,点B,C,E在同一直线上,AD=4,连接BD,BF,DF,直接写出△BDF的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/66dc2a95-b6ec-4d36-bb5d-03d3d9fe1214.png?resizew=460)
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解答题-证明题
|
适中
(0.65)
【推荐2】已知:正方形纸片
,将纸片折叠,使点
落在
处,折痕经过点
交
于点
.如图①,当
延长线交
于
时,易证:
.如图②,当
延长线交
延长线于
时,如图③,当折痕的延长线交
延长线于
,
延长线交
延长线于
时,
、
、
又有怎样的数量关系?请写出你的猜想,并选择一种情况给予证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bbcfbe9e1fe4b82f3c854b17c1359c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac8eb600ed2394e5456e8fa33a5b2d2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/28/023f7894-f477-48e8-aefa-e4952575215e.png?resizew=575)
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