如图,在△ABC中,AB=AC,AB的垂直平分线交AC于点E,交AB于点D.
(1)若∠A=40°,求∠CBE的度数;
(2)若△BCE的周长为8cm,AB=5cm,求BC的长.
(1)若∠A=40°,求∠CBE的度数;
(2)若△BCE的周长为8cm,AB=5cm,求BC的长.
![](https://img.xkw.com/dksih/QBM/2019/3/5/2154061025959936/2155495131996160/STEM/b04a14bf30ec48ff8e5bc89fd5dde3a8.png?resizew=97)
更新时间:2019-03-07 19:08:59
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【知识点】 线段垂直平分线的性质解读
相似题推荐
解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,由小正方形构成的9×9网格,每个小正方形的顶点叫做格点,
经过A,B,C三个格点,仅用无刻度的直尺在给定网格中按要求画图.(保留连线痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/90bf6022-d5bc-45b9-8d75-434b9595d241.png?resizew=481)
(1)在图(1)中作线段
的垂直平分线;
(2)在图(2)中的
上画点E,使
;
(3)在图(3)中画出
的圆心O;在
上画出点F,使
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/90bf6022-d5bc-45b9-8d75-434b9595d241.png?resizew=481)
(1)在图(1)中作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在图(2)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f8688a3b7f65673722a11c9acc93b9.png)
(3)在图(3)中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51bb339ba41929e8f693b3618d5ee4b9.png)
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解答题-作图题
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【推荐2】如图,在
中,
的角平分线交
于点D.
(1)用尺规完成以下基本作图:作
的垂直平分线,分别与
、
、
交于点E、点F、点H,连接
;(保留清晰作图痕迹,不写作法,不下结论)
(2)在(1)所作的图形中,完成下面证明
的过程:
证明:∵
的角平分线交
于点D,∴
___①.
∵
垂直平分
,∴
,
___②.
∴
.∴___③.
又∵
,∴
___④
.
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/fe88c491-5492-4bc7-8eac-0ed657c4cd0c.png?resizew=279)
(1)用尺规完成以下基本作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)在(1)所作的图形中,完成下面证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c2c59b45364d2cb0ae7048c861e7c22.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494ba20b1444f524cf636961e4688ae8.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53eb936ad0b541f19279a01ecd9e29e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4dd9aa2b453b60ba3250ad5a315d1b5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d25ddcd17f9de36605363fe32c361b.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34336629db1e6c508fdca5bb8c434d4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e42d83748ebc0f3169c21f7605134f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58612b6ca72327c8f9ec43a684d0eb49.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c2c59b45364d2cb0ae7048c861e7c22.png)
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