名校
1 . 证明:如果两个三角形有两条边和其中一条边上的高分别相等,那么这两个三角形全等.(请根据图形,补全已知和求证,并写出证明过程)
已知:如图,在
和
中,
,________,
为
边上的高,
为
边上的高,且
.
求证:________________.
证明:
已知:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d163ba9cef35eb600387bcfbbda89ac.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/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa99df6611cc6c966fe54da49cbbc46.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/8bcf4af7-dc83-4e34-aa5f-d594d15e9c8b.png?resizew=259)
求证:________________.
证明:
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2 . 如图,已知点A,D,B,E在同一条直线上,
,
,
.
(1)求证:
:
(2)判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d6e7ef3f341fd85acde9f60eaaff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c226581e14091779321c9fe91160ceef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/b933f80b-88c1-415c-b335-98c8ad7d2215.png?resizew=224)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1323c31873c713818327c88340d2d1c2.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafabd077934109c38255fa6d3a8bb60.png)
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3 . 如图,
都是等边三角形,点A、点
、点
在同一直线上.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a55bb3966fe825372876b2998357d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e6363330b33ca9feda927e6ffd3088.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/b286f72a-0e3d-455f-9307-c7858a92398d.png?resizew=158)
您最近一年使用:0次
4 . 如图1,在
中,
,
,D为
上一点,连接
,将
绕点C顺时针旋转
至
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/4c8804f3-c526-4d9b-9c94-13075500de32.png?resizew=346)
(1)求证:
;
(2)如图2,连接
,若
,
,求
的长.
![](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/4b10134e7a46e6f6f7cb9d5e2371727d.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/4c8804f3-c526-4d9b-9c94-13075500de32.png?resizew=346)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe2c34a83631c3127ca5896e00cda297.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321f96c4f808afe67cf565ca74ae0351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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5 . 如图所示.在
中,已知
,
,D是
上的一点,
,
,点F为
的中点.
求证:
(1)
;
(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/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25f8eb66299a0f6650c331d4f50d47d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4760b2ea8943686bf14817f8c887926e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/0ed971aa-e349-432e-9f55-46018f4bb213.png?resizew=185)
求证:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876bb8ce0ca53475fa091ffd18bdc94a.png)
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6 . 在测量一个小口圆形容器的壁厚时,小明用“
型转动钳”按如图方法进行测量,其中
,测量
的长度即可知道
的长度.此方法用到了一个重要的和两个三角形有关的数学知识是________ ;这个数学知识成立的依据是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a6181c814dd384503b0ca640d4f0a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/0cc3963e-4424-47e7-ba05-1070fb042e26.png?resizew=117)
您最近一年使用:0次
解答题-问答题
|
较易(0.85)
|
7 . 如图,已知
,
;②
;③
;④
得到
.你添加的条件是:________.(填序号)
(2)选择(1)中的一种情况进行证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e988754bfacf7d4a5c1b2d079346488a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d6e7ef3f341fd85acde9f60eaaff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c226581e14091779321c9fe91160ceef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b69473ad1b7e56af6e45d11b8c01a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d6f0530c49174047e866dbf2ae1ea4.png)
(2)选择(1)中的一种情况进行证明.
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8 . 如图,已知
,若依据“
”证明
,则需增加的一个条件是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a702c324e0c76150540c3d32df802077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a290f047f50481318d040c604d72f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b50834e39c4e028e0fc303b94d571923.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/fa70fab8-4db6-40bc-9a36-73b53959d519.png?resizew=123)
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9 . 如图,
和
都是等边三角形,点
在
边上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/4d75f7f2-0b1f-4699-b18c-0949e52ea665.png?resizew=116)
(1)在图中找一对全等三角形,并说明理由;
(2)在(1)中全等三角形中,其中一个是另一个经过怎样的图形变换得到的?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/4d75f7f2-0b1f-4699-b18c-0949e52ea665.png?resizew=116)
(1)在图中找一对全等三角形,并说明理由;
(2)在(1)中全等三角形中,其中一个是另一个经过怎样的图形变换得到的?
您最近一年使用:0次
10 . 如图,方明家仿古家具的一块三角形形状的玻璃坏了,需要重新配一块,方明通过电话给玻璃店老板提供相关数据,为了方便表述,将该三角形记为
,提供了下列各组元素的数据,配出来的玻璃不一定符合要求的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/4/3de8d30d-3f67-40a3-a5d2-3a9644d04977.png?resizew=220)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/4/3de8d30d-3f67-40a3-a5d2-3a9644d04977.png?resizew=220)
A.![]() ![]() ![]() | B.![]() ![]() ![]() | C.![]() ![]() ![]() | D.![]() ![]() ![]() |
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