如图,AD是△ABC的角平分线,DE⊥AB,DF⊥AC,垂足分别是E,F,连接EF,EF与AD相交于点G.
(1)求证:AD是EF的垂直平分线;
(2)若△ABC的面积等于16,AB+AC=8,求ED.
(1)求证:AD是EF的垂直平分线;
(2)若△ABC的面积等于16,AB+AC=8,求ED.
![](https://img.xkw.com/dksih/QBM/2021/8/27/2794933738094592/2797488120209408/STEM/aafb80c7982d4c7e9a944a5e044d0f80.png?resizew=177)
更新时间:2021-08-30 20:07:03
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解答题-证明题
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【推荐1】如图,在
中,
,
,点
是
上的一点,且
,
,垂足分别为点
、
,求证:
垂直平分
.
![](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/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fb30a9d07e410ac92c34b8ad0133db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca0940f5c21431c089d4f7a221df43c.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/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/8245d155-cb50-4877-8e8f-c090226e5473.png?resizew=162)
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解答题-证明题
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【推荐2】如图,矩形
中,E是
上一点,且
于点F.
![](https://img.xkw.com/dksih/QBM/2021/5/5/2714342016237568/2714630588424192/STEM/80efe8994f874a078ff04cfe355042f0.png?resizew=137)
(1)求证:
.
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cde8bfc4559cc27865881082fcb4bfc.png)
![](https://img.xkw.com/dksih/QBM/2021/5/5/2714342016237568/2714630588424192/STEM/80efe8994f874a078ff04cfe355042f0.png?resizew=137)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd052a3a559b3d38e972f93a3bbdab57.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c174743f61c6a0952fc836a2dd5bcf5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
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解答题-作图题
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适中
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【推荐1】如图,在
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/d3f44f98-19e3-408f-a63e-960851a81b12.png?resizew=170)
(1)请用尺规作图:作
的平分线
,
交
于点
;(保留作图痕迹,不要求写作法)
(2)若点
恰好在线段
的垂直平分线上,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7281b641656a5992abaafb4190ca9afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e45f358e083cc52c0352865c54e0ac4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/d3f44f98-19e3-408f-a63e-960851a81b12.png?resizew=170)
(1)请用尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/8455657dde27aabe6adb7b188e031c11.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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解答题-作图题
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【推荐2】已知:四边形
.
求作:点
,使
,且点
到边
和
的距离相等.(写出作图的方法,不必写具体步骤,保留作图痕迹)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
求作:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90980b87559307b9d22fa58ccfcab6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/16bc88a1-9cc8-4a74-8981-820addc6603d.png?resizew=159)
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解答题-证明题
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【推荐1】如图,四边形
中,
,
.我们把这种两组邻边分别相等的四边形叫做“筝形”.
概念理解
(1)根据上面教材的内容,请写出“筝形”的一条性质:____________________;
(2)如图1,在
中,
,垂足为
,
与
关于
所在直线对称,
与
关于
所在直线对称,延长
,
相交于点
.请写出图中的“筝形”: ____________________;(写出一个即可)
应用拓展
(3)如图2,在(2)的条件下,连接
,分别交
,
于点
,
,连接
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4908fad3dc6fe1b0675c870328f043ef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/18/b0c138a5-518c-488e-9639-cad7162c8237.jpg?resizew=80)
概念理解
(1)根据上面教材的内容,请写出“筝形”的一条性质:____________________;
(2)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14b86b8bf99386fc939c9c12b1355ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4c625a55ef1d2920a0605d52c8da23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55bd1ad9e6d1bb7403eff61ad2b10b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644f63756fe9251e65cc14e1ce9723d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
应用拓展
(3)如图2,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d90c12381151f48fad6d3ad39247f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/18/5e342b44-476f-4555-b0e9-b1f397efac53.jpg?resizew=239)
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解答题-问答题
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【推荐2】阅读与思考
请阅读下列材料,并完成相应的任务.
数学活动课上,老师提出用尺规作图过直线外一点作已知直线的垂线.
已知:如图,点
是直线
外一点.
求作:过点
且与直线
垂直的直线.
“奋进”小组的同学经过讨论,得到这样一种作法:
①在直线
上任取两点
,
;
②以点
为圆心,
长为半径作弧,以点
为圆心,
长为半径作弧,两弧交于点
;
③作直线AD.
直线AD即为所求
“奋进”小组的同学想说明这一作法的合理性,他们的推理过程如下:
理由:连结
,
由作法可知:
,
点
在
的垂直平分线上,
点
在
的垂直平分线上,(依据 )
是
的垂直平分线,
.
(1)上述证明过程中的“依据”是指什么?
(2)如图,利用“奋进”小组同学的作法作
边
上的高
.
(3)若
,求
的面积.
请阅读下列材料,并完成相应的任务.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/2389196d-e8b3-44e8-92cb-cc1e076b9d90.png?resizew=145)
数学活动课上,老师提出用尺规作图过直线外一点作已知直线的垂线.
已知:如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
求作:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
“奋进”小组的同学经过讨论,得到这样一种作法:
①在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
②以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
③作直线AD.
直线AD即为所求
“奋进”小组的同学想说明这一作法的合理性,他们的推理过程如下:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/8c44ffb5-b8b9-4549-aaff-986778e21241.png?resizew=157)
理由:连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9358c7b8adeacbab22362a8199b4d7.png)
由作法可知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b41cd18b4d3c1d898e309f03faaba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
点
![](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/9e8d4ba86966baab5a804414573ca070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0672304d9c26d72538ee0eb692baf6.png)
(1)上述证明过程中的“依据”是指什么?
(2)如图,利用“奋进”小组同学的作法作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/2bc0bd78-b2b8-49d6-90df-480b0758a284.png?resizew=190)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c45777edd1b90a3ddda4fccb40403a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
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