1 . 下面是证明直角三角形的性质定理:“直角三角形斜边上的中线等于斜边的一半”的两种添加辅助线的方法,选择其中一种,完成证明.
直角三角形性质定理:直角三角形斜边上的中线等于斜边的一半.![]() 已知:如图,Rt ![]() ![]() 求证: ![]() | |
方法一: 证明:如图,延长 ![]() ![]() ![]() 连接 ![]() ![]() | 方法二: 证明:如图,取 ![]() ![]() ![]() ![]() |
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2 . 下面是证明直角三角形斜边中线定理的两种添加辅助线的方法,选择其中一种,完成证明.
直角三角形斜边的中线等于斜边的一半. 已知:如图, ![]() ![]() ![]() ![]() ![]()
| |
方法一 证明:如图,取 ![]() ![]()
| 方法二 证明:如图,延长 ![]() ![]() ![]() ![]() ![]()
|
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2023-07-08更新
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3卷引用:北京市平谷区2022-2023学年八年级下学期期末数学试题
北京市平谷区2022-2023学年八年级下学期期末数学试题北京市平谷区第五中学2023-2024学年八年级下学期期中数学试题(已下线)期末模拟卷02-【好题汇编】备战2023-2024学年八年级数学下学期期末真题分类汇编(北京专用)
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3 . 如图,正方形
.过点B作射线
,交
的延长线于点P.点A关于直线
的对称点为E,连接
.其中
分别与射线
交于点G,H.
(2)设
,
______(用含
的式子表示),
______
;
(3)若
,用等式表示线段
与
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/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819cd6f1ccc05d4a63223e8607fec0bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/824513ba3c12cec2601b75e831e8b4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8573bdd09f4da66c67306ae060801a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d63783f365e666ace307cadcaba60fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94c44345de7d1f37b48def25db8c5e2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c81b918e83cc3673cda4b89014120c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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2023-07-05更新
|
671次组卷
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2卷引用:北京市东城区2022-2023学年八年级下学期期末数学试题
4 . 如图,在
中,
平分
交
于
,
垂直平分
,分别交
,
,
于E,F,G,连接
,
.
(1)求证:四边形
是菱形;
(2)若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/b3ff0bfe-61ef-4de2-8d2b-8433438cffe3.png?resizew=305)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b258e0524f58c79bd45f43159cfefc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7dd285b3a7682aa5c527e422c5d68f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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2023-06-26更新
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103次组卷
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2卷引用:北京市海淀区首都师范大学第二附属中学2022~2023学年九年级下学期4月月考数学试题
5 . 如图,在四边形
中,
,
,对角线
的垂直平分线与边
、
分别交于点F,E.
(1)猜想图中四边形
的形状是______形,并证明你的猜想;
(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/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.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://img.xkw.com/dksih/QBM/editorImg/2023/6/29/28944634-d21c-4beb-a847-be222a316bd1.png?resizew=224)
(1)猜想图中四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49437f474e5805688dff21ded2d1fd7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
您最近一年使用:0次
名校
6 . 如图,
(非直径)为
的两条弦,
与
交于点
,请从①
为
直径;②
为
中点;③
为
中点;中选择两个作为题设,余下的一个作为结论组成一个真命题,并完成证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/19/bb4c95fd-5d9a-4c24-998e-8c5be7432329.png?resizew=102)
您最近一年使用:0次
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7 . 下面是小芸同学证明定理时使用的两种添加辅助线的方法,选择其中一种,完成证明.
定理:直角三角形斜边上的中线等于斜边的一半. 已知:如图,在 ![]() ![]() ![]() ![]() 求证: ![]() |
| |
方法一: 证明:延长 ![]() ![]() ![]() 连接 ![]() ![]()
| 方法二: 证明:过点 ![]() ![]() ![]()
|
您最近一年使用:0次
2023-06-14更新
|
182次组卷
|
3卷引用:2023年北京市师达中学中考四模数学试题
名校
8 . 如图,在等边
中,D,E,F分别是
边中点,点P为
上一点,作线段
的垂直平分线交线段
于点M,连接
.
(1)依题意补全图形;
(2)若
,
①请用含
的式子表示
;
②判断
的形状,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe6fb5b2ae5be28699605a3b24f46ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7515cf3e87e86115e4bd9f9f55cd116.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/5/cca82679-e32b-43f0-a612-aa41c960adae.png?resizew=144)
(1)依题意补全图形;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82857ceb0f5354cdca49a86c1d9706df.png)
①请用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b6500fbe1ea4a372d703502699b809e.png)
②判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4d5540930e71aed008b17277d8b0d3.png)
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9 . 已知:线段
及射线
.
求作:等腰
,使得点C在射线
上.
作法一:如图1,以点B为圆心,
长为半径作弧,交射线
于点C(不与点A重合),连接
.
作法二:如图2.
①在
上取一点D,以点A为圆心,
长为半径作弧,交射线
于点E,连接
;
②以点B为圆心,
长为半径作弧,交线段
于点F;
③以点F为圆心,
长为半径作弧,交前弧于点G;
④作射线
交射线
于点C.
作法三:如图3,
①分别以点A,B为圆心,大于
的同样长为半径作弧,两弧分别交于点P,Q;
②作直线
,交射线
于点C,连接
.根据以上三种作法,填空:
由作法一可知:______
,
∴
是等腰三角形.
由作法二可知:
______
,
∴
(__________________)(填推理依据).
∴
是等腰三角形.
由作法三可知;
是线段
的______.
∴
(__________________)(填推理依据).
∴
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
求作:等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/2/c612a971-16e7-48e2-a2af-43369245f712.png?resizew=432)
作法一:如图1,以点B为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
作法二:如图2.
①在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
②以点B为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
③以点F为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
④作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
作法三:如图3,
①分别以点A,B为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
②作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
由作法一可知:______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107ce4aed7057a8d048bbe34f7fec9f6.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
由作法二可知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4547137c187f693249a50709c85b99.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
由作法三可知;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2023-05-31更新
|
286次组卷
|
3卷引用:2023年北京市顺义区中考数学二模试题
2023年北京市顺义区中考数学二模试题(已下线)专题16 作图与图形变换-学易金卷:5年(2019-2023)中考1年模拟数学真题分项汇编(全国通用)吉林省长春市长春净月高新技术产业开发区2023-2024学年八年级上学期期末数学试题
22-23八年级下·北京房山·期末
10 . 如图,
中,对角线
、
交于点
,在
上截取
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/0311beda-09d0-43f7-9c81-26a1147bb5f7.png?resizew=169)
(1)求证:四边形
是矩形;
(2)若
平分
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/140839de57934a92dbba2a4726eed5b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/0311beda-09d0-43f7-9c81-26a1147bb5f7.png?resizew=169)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
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