对于下面每个三角形,过顶点A作出三角形的中线、角平分线和高.
![](https://img.xkw.com/dksih/QBM/2017/9/13/1773342126768128/1773349651775488/STEM/4ae6e8b608eb4b28af8bf6c31aa2a91c.png?resizew=484)
更新时间:2017-09-13 21:12:00
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相似题推荐
解答题-作图题
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【推荐2】在如图所示的方格纸中,每个小正方形的边长为1,每个小正方形的顶点都叫做格点.(请利用网格作图,画出的线请用铅笔描粗描黑)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/537d011a-fc36-49cb-9d91-0085f190d9bf.png?resizew=176)
(1)过点C画
的垂线,并标出垂线所过格点E;
(2)过点C画
的平行线
,并标出平行线所过格点F;
(3)连接
,则三角形
的面积为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/537d011a-fc36-49cb-9d91-0085f190d9bf.png?resizew=176)
(1)过点C画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)过点C画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6d50515fc65885d44cd6a3c41e6a7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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解答题-计算题
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【推荐1】已知
的面积是
,请完成下列问题:
![](https://img.xkw.com/dksih/QBM/2022/2/21/2921407222390784/2924139749195776/STEM/4f089f968c524d72990fa97992d0d648.png?resizew=527)
(1)如图
,若
是
的
边上的中线,则
的面积______
的面积
填“
”“
”或“
”
;
(2)如图
,若
、
分别是
的
、
边上的中线,
和
交于点
求四边形
的面积可以用如下方法:
连接
,由
得:
,同理:
,
设
,
,则
,
,
由题意得:
______,
______,可列方程组为:
.
解得______,通过解这个方程组可得四边形
的面积为______;
(3)如图
,若点
、点
分别在线段
和
上,满足
:
:
,
:
:
,
和
交于点
请你计算四边形
的面积,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
![](https://img.xkw.com/dksih/QBM/2022/2/21/2921407222390784/2924139749195776/STEM/4f089f968c524d72990fa97992d0d648.png?resizew=527)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](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/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17e6131a1893b2215d56bcf56871c66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3387a23d14e10d69792760eb97904782.png)
连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f855c80172c04310d342f82d960011ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a8e5cdbfe68814d5a3cbb9e657ba2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a46afa0b7e149f832577461f00491bc6.png)
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98acad82dd1407704ba387213db76f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf91bf9799c5c8d2b078ee92338276a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94e426f198e36c9234fee01a36b9951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3633e3e4087442a3104c7aafb413b30.png)
由题意得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe100dcf8b4ce8ac79f308a6eb0d304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d570cc054acad5b67e4dcc2c8be80be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66edb1824d1365cdfca9f3ee481cd662.png)
解得______,通过解这个方程组可得四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3387a23d14e10d69792760eb97904782.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1772fcf5995e63876fe258e38cfbdb03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8672db5688d9cd4e690da0364146b849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3387a23d14e10d69792760eb97904782.png)
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【推荐2】小小设计师——探究面积等分问题
问题提出:
物业公司计划绿化一块不规则空地,要求使用一条直线将空地分为面积相等的两部分,一部分种花,另一部分种植绿色植被.若你是设计师,应怎样设计才能满足要求?
探索化归:
若一条直线把一个平面图形分为面积栩等的两部分,那么我们把这条直线称为这个平面图形的一条面积等分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/d6cab011-d445-4833-bb2d-f223defa5331.png?resizew=536)
(1)小明从最简单的图形——三角形入手,很快就想到了它的一条面积等分线.如图1.过点A,利用尺规作出一条
的面积等分线(保留作网痕迹,不写作法);
(2)平行四边形是中心对称图形,过对称中心的直线可以将其分成面积相等的两部分.图2由一个平行四边形和一个正方形组成,请仅用无刻度直尺画出这个图形的一条面积等分线(保留作图痕迹,不写画法);
问题解决:
(3)在等分图形面积的过程中,小明发现了如下结论:
如图,
,点
,
,
在
上,点
,
在
上,则
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/5743a24d-399c-45dc-8ddb-3a80c4482656.png?resizew=224)
如图3,四边形
中,
与
不平行,
,且
,请在图3中,过点
画出四边形
的一条面积等分线,写出画法,并说明理由.
问题提出:
物业公司计划绿化一块不规则空地,要求使用一条直线将空地分为面积相等的两部分,一部分种花,另一部分种植绿色植被.若你是设计师,应怎样设计才能满足要求?
探索化归:
若一条直线把一个平面图形分为面积栩等的两部分,那么我们把这条直线称为这个平面图形的一条面积等分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/d6cab011-d445-4833-bb2d-f223defa5331.png?resizew=536)
(1)小明从最简单的图形——三角形入手,很快就想到了它的一条面积等分线.如图1.过点A,利用尺规作出一条
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)平行四边形是中心对称图形,过对称中心的直线可以将其分成面积相等的两部分.图2由一个平行四边形和一个正方形组成,请仅用无刻度直尺画出这个图形的一条面积等分线(保留作图痕迹,不写画法);
问题解决:
(3)在等分图形面积的过程中,小明发现了如下结论:
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/027830fc47290062692964077ee481e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57b877cb3d4538a16cb8c54a9e7df75.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/5743a24d-399c-45dc-8ddb-3a80c4482656.png?resizew=224)
如图3,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/9c9e5df1deb0777794ec0c8d44571409.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c777796ea59e26b828e8c7ee01dcdbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】如图(1)在三角形
中,
的平分线
与
的平分线
交点O,求
与
的关系.
![](https://img.xkw.com/dksih/QBM/2019/12/2/2346341579415552/2346432128917505/STEM/e10bb2d3124b42a6b94ab596a66b9b1b.png?resizew=120)
如图(2)在三角形
中,
的外角平分线
与
的外角平分线
交于点O,试求
与
的关系;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a122e25cf4eb9f03ffe5ec823bfc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://img.xkw.com/dksih/QBM/2019/12/2/2346341579415552/2346432128917505/STEM/e10bb2d3124b42a6b94ab596a66b9b1b.png?resizew=120)
如图(2)在三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a122e25cf4eb9f03ffe5ec823bfc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://img.xkw.com/dksih/QBM/2019/12/2/2346341579415552/2346432128917505/STEM/66e98565b50c40b59ed7b51e65d80b30.png?resizew=116)
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【推荐2】如图,在△ABC中,AD是BC边上的高,AE是∠BAC的平分线,∠B=44°,∠DAE=15°,求∠C的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/78f1a479-b191-4b1b-9851-d7b55a855cfe.png?resizew=165)
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