如图,在菱形
中,对角线
相交于点O,
.
(1)求证:四边形
是矩形;
(2)若
,
,求四边形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67397a90043e338f5a71599ee3d01b65.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/d1edaf96-d710-490f-9f2c-1ad807a9204f.jpg?resizew=137)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3827554ef88bce8ae0e3755b07443080.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06201e4f55b78d8b30afb257d5a1b16b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3827554ef88bce8ae0e3755b07443080.png)
更新时间:2023-10-28 21:25:16
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】根据题意,解答问题:
(1)如图
,已知直线
与x轴、y轴分别交于A、B两点,求线段AB的长.
(2)如图
,类比(1)的解题过程,请你通过构造直角三角形的方法,求出点
与点
之间的距离.
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae3059f133fc02da35a24fb98953dde.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/403565f98b1909f99a7bf2578cd16a60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c8f9cd1802cb0506372ce9895801ee3.png)
![](https://img.xkw.com/dksih/QBM/2018/12/15/2097245735084032/2099380728111104/STEM/b5998ac3-34f0-427c-b832-983f170d6225.png?resizew=391)
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解答题-证明题
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适中
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【推荐2】如图,矩形
中,
的垂直平分线分别交
、
于E、F,垂足为O,连接
、
.
的形状,并说明理由;
(2)若
cm,
cm,动点P从D出发沿折线
运动至B停止,同时点Q从E出发沿折线
运动至E停止,设P、Q的运动路程分别为a、b(单位:
,
),当以E、F、P、Q四点为顶点的四边形是平行四边形时,求a与b满足的数量关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/a8bdae3d30abf70515bdbd45f9d0c380.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d032bd2ccb64e1b027dc06c42119a59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217fb2406d6a6b37751dfda9ee6b1bdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/079f657db00981fa4f99d53474e1eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9179bee09452bbd0e5080501bb0ee9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eae9ba258299eb489b490594397e23c.png)
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解答题-证明题
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【推荐1】如图,在
中,
,
是斜边
上的中线,
的中位线
交
于点O,连接
.求证:四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40cf622bba19ecaa44173fa7ac89dc93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08c14e87a2bcf7090eab2fea73667d2.png)
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解答题-作图题
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适中
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【推荐2】如图,已知正六边形ABCDEF,请仅用无刻度的直尺,分别按下列要求画图.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/b10c0a3e-d82a-422b-9432-44c24fbb6147.png?resizew=321)
(1)在图1中,G是AF的中点,过G点作图形的对称轴;
(2)在图2中,G、H分别是AF、CD的中点,画出顶点在六边形的边的中点上的矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/b10c0a3e-d82a-422b-9432-44c24fbb6147.png?resizew=321)
(1)在图1中,G是AF的中点,过G点作图形的对称轴;
(2)在图2中,G、H分别是AF、CD的中点,画出顶点在六边形的边的中点上的矩形.
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解答题-问答题
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适中
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【推荐1】已知如图,斜坡
的坡度为
,斜坡
的水平长度为24米在坡顶A处的同一水平面上有一座古塔
在斜坡底P处测得该塔的塔顶B的仰角为
,在坡顶A处测得该塔的塔顶B的仰角为
.求:
(1)坡顶A到地面
的距离;
(2)古塔
的高度(结果保留根号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdaf5fb1b60d014a8c535baf0670fa8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/28/b2fb429c-8c94-42b8-a02d-e747202a32f1.png?resizew=191)
(1)坡顶A到地面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)古塔
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-问答题
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【推荐2】如图,在
中,
,
,
,动点P从点A出发沿
方向以每秒5个单位长度的速度向终点C运动,当点P不与点A、C重合时,过点P作
于点Q,将线段
绕点P逆时针旋转
得到线段
,连接
.设点P的运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/dd075530-8a15-4b07-9c3c-e604e829512d.png?resizew=206)
(1)线段
的长为______(用含t的代数式表示).
(2)当点R落在
边上时,求t的值.
(3)当C、R、Q三点共线时,求t的值.
(4)当
为钝角三角形时,直接写出t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d7b816eca15d4b7d060013df53edd53.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/dd075530-8a15-4b07-9c3c-e604e829512d.png?resizew=206)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(2)当点R落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)当C、R、Q三点共线时,求t的值.
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c036eb374274491f675ec50552d517a.png)
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解答题-证明题
|
适中
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【推荐1】已知:如图,菱形
对角线交于点
,
,
.
是矩形;
(2)在矩形
中,
,
,求菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1f406b3ff8561a371a39908fd813f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cccde778c619848076ea8c11b0b13a12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e89d43151016343d2ab6c4851565e7.png)
(2)在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e89d43151016343d2ab6c4851565e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0268d04b9dea7629af27af9a0285a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-证明题
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适中
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【推荐2】如图,四边形
是边长为2,一个锐角等于
的菱形纸片,小芳同学将一个三角形纸片的一个顶点与该菱形顶点D重合,按顺时针方向旋转三角形纸片,使它的两边分别交
(或它们的延长线)于点E、F,
,当
时,如图1小芳同学得出的结论是
.
![](https://img.xkw.com/dksih/QBM/2021/11/8/2846898229460992/2850220178407424/STEM/5424f512-6232-4953-93df-30512acbcf98.png)
(1)继续旋转三角形纸片,当
时,如图2小芳的结论是否成立?若成立,加以证明;若不成立,请说明理由;
(2)再次旋转三角形纸片,当点E、F分别在
的延长线上时,如图3请先写出
与
的数量关系;并说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f327982ed5868833a895a1b3d1e592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f3bba5bd11e850c9b766c2ba6c426d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a42c17fe4d91d67c1fa43f966bffd891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://img.xkw.com/dksih/QBM/2021/11/8/2846898229460992/2850220178407424/STEM/5424f512-6232-4953-93df-30512acbcf98.png)
(1)继续旋转三角形纸片,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69125a3e5987d13dc1e45a0c2b5c8f58.png)
(2)再次旋转三角形纸片,当点E、F分别在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f327982ed5868833a895a1b3d1e592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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