如图,∠B=∠C=90°,点E为BC的中点,DE平分∠ADC,过点E作EF⊥AD,垂足为F,连结AE、BF.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893510039019520/2950412635750400/STEM/9d6eba2e-3fc1-4d10-b59c-772b67006150.png?resizew=140)
(1)求证:AE是∠DAB的平分线.
(2)求证:线段AE垂直平分BF.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893510039019520/2950412635750400/STEM/9d6eba2e-3fc1-4d10-b59c-772b67006150.png?resizew=140)
(1)求证:AE是∠DAB的平分线.
(2)求证:线段AE垂直平分BF.
更新时间:2022-04-03 21:32:47
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解答题-证明题
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【推荐1】如图,在△ABC中,AB=AC,BE⊥AC于点E,CD⊥AB于点D,BE、CD相交于点F,连接AF.
求证:(1)△AEB≌△ADC;
(2)AF平分∠BAC.
求证:(1)△AEB≌△ADC;
(2)AF平分∠BAC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/7a1e6dad-8a83-4c9e-b0ee-63d40be7ca28.png?resizew=158)
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【推荐2】若
和
均为等腰三角形,且
,当
和
互余时,称
与
互为“底余等腰三角形”,
的边BC上的高AH叫做
的“余高”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/7554e1f7-7d94-4d20-b77a-8e10e368c3f9.png?resizew=320)
(1)如图1,
与
互为“底余等腰三角形”,若连接
,
,判断
与
是否互为“底余等腰三角形”:______(填“是”或“否”);
(2)如图1,
与
互为“底余等腰三角形”,当
时,若
的“余高”是
.
①请用直尺和圆规作出
;(要求:不写作法,保留作图痕迹)
②求证:
.
(3)如图2,当
时,
与
互为“底余等腰三角形”,连接
、
,若
,
,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/7554e1f7-7d94-4d20-b77a-8e10e368c3f9.png?resizew=320)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
(2)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4dfaf6a3495bbab40bd0673ded40a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
①请用直尺和圆规作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb641c9871935e90c00688558e3e502.png)
(3)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73538c09794f3223540bfe074edff82b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-证明题
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【推荐1】如图,在四边形
中,
平分
,
,
于点E.
(1)求证:
;
(2)若
,求
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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(1)求证:
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636af20ea241c68db2df0c9b87ff39e8.png)
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【推荐2】如图,已知直线
,
相交于点
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解答题-证明题
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【推荐1】如图(1),点
为正方形
内一动点,连接
,
,且
,以
为边向右侧作等腰直角三角形
,
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/5b0be9b4-761a-4850-931b-8f572457a98a.png?resizew=455)
(1)求
的度数;
(2)如图(2),连接
,若
.
①求证:
=
;
②求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024015816ece1fd176186ed0f04db8f9.png)
(2)如图(2),连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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①求证:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d4b4f508b7ab4e842831777d5f68a8.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9bf6756fca813855541f6d3292efa4.png)
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【推荐2】如图,等腰三角形ABC中,AC=BC=6,AB=8,以BC为直径作⊙O交AB于点D,交AC于点G,DF⊥AC,垂足为F,交CB的延长线于点E.
(1)求证:直线EF是⊙O的切线;
(2)求sin∠E的值.
(1)求证:直线EF是⊙O的切线;
(2)求sin∠E的值.
![](https://img.xkw.com/dksih/QBM/2020/2/16/2400283152121856/2401031669547008/STEM/90a125f195fd401d9b71a06865c57357.png?resizew=166)
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