已知在
中,
,用尺规作图,作出
的内切圆,与边
、
、
分别交于点
(保留作图痕迹).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/20243420-3fb3-4013-ba55-dc0a525babec.png?resizew=89)
更新时间:2023-12-30 00:16:55
|
相似题推荐
解答题-作图题
|
较易
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名校
【推荐1】如图,在平行四边形
中,完成下列作图和证明过程.
上截取
,作
的角平分线交
于点F,连接
,
(保留作图痕迹,不写作法);
(2)求证:
.
证明:∵
,
∴________
又∵
平分
,
∴
.
∴________
∴
.
∵
,
∴
且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4747cb7fddc24b1e92239a884c6f307a.png)
∴四边形
是平行四边形
又∵
,
∴________
∴
(________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.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/49b50357a6545cae8348e3059312f520.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187ed13a7bd532bd39af5e5ad7493a2c.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4747cb7fddc24b1e92239a884c6f307a.png)
∴________
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b54f64681aa757d8b6a2474377b1e67.png)
∴________
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bae20ce509b25695607c660bf7023fa.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22f1ef3ad9a1670758a021163f7c3b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4747cb7fddc24b1e92239a884c6f307a.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
∴________
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187ed13a7bd532bd39af5e5ad7493a2c.png)
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解答题-作图题
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较易
(0.85)
名校
【推荐2】如图,四边形
是平行四边形.
上取点E,使
,连接
,作
的平分线交
于F;(保留作图痕迹,不写作法)
(2)根据(1)中作图,求证:
,补充完成下列证明过程(答案填写在答题对应标号位置).
证明:∵
平分
,∴
______,
∵四边形
是平行四边形,∴
,
,
∴
______,
∴
,∴
______,
∵
,∴
,
∵
,∴
______,
∵
,∴四边形
为______,∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(2)根据(1)中作图,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5231c160d4575c7339e08e209b8d5d.png)
∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9f07a876244afec67a0eca4d45c2e6.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5231c160d4575c7339e08e209b8d5d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8917575d75c8cbc9d82477e7cac656be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aeb7d8bfd4877a9bd85b7cc69aec40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5277fa450a0c513a86a74420f8ee99f6.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d02468072783e4c6d0ab7c93e83350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e41003131c669f518bc8485620486fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
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解答题-作图题
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【推荐1】如图,是一块三角形的纸板,要从这块纸板上裁下一块圆形的用料,并使圆形用料的面积最大,请你确定此圆的圆心O.(尺规作图,保留痕迹,不写作法和证明.)
![](https://img.xkw.com/dksih/QBM/2021/6/8/2738594654568448/2739132378767360/STEM/ab9a723c-2ddc-4e23-9e5b-c0d278a55606.png?resizew=203)
您最近一年使用:0次
解答题-作图题
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较易
(0.85)
名校
【推荐2】如图,在
中,
为
的平分线,请用尺规作图法,求作
的内心.(保留作图痕迹,不写作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次