如图,
点为
上的点,
为
上的点,
,
.试说明:
.
(______),
(______),
(______).
______
______(同位角相等,两直线平行).
(____________).
又
(______),
(______),
(____________)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1beff025b32f688316009552d2fd8e1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/424269ceef173843aae76e39ecdf6111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c08980b6afedc04aa04f385791f0163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50ce9ef89a466df68124a1dccff5663.png)
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又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65180e437fd35b55ff5808e8804d9c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0716532ec68cc402d60b74300aac3a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7698322222612578b1ddb991f776853.png)
更新时间:2024-04-19 16:19:07
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解答题-证明题
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较易
(0.85)
【推荐1】已知AB⊥BC,AB⊥DE,垂足分别为B,D,∠1=∠2,求证:∠BEC+∠FGE=180°.
请你将证明过程补充完整,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/5e550bcf-4aa8-4b93-91c7-820840c6541e.png?resizew=106)
证明:∵AB⊥BC,AB⊥DE,垂足分别为B,D(已知),
∴∠ABC=∠ADE=90°(垂直定义),
∴
,
∴∠1= ,
又∵∠1=∠2(已知),
∴∠2= ,
∴
( ),
∴∠BEC+∠FGE=180°( ).
请你将证明过程补充完整,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/5e550bcf-4aa8-4b93-91c7-820840c6541e.png?resizew=106)
证明:∵AB⊥BC,AB⊥DE,垂足分别为B,D(已知),
∴∠ABC=∠ADE=90°(垂直定义),
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
∴∠1= ,
又∵∠1=∠2(已知),
∴∠2= ,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
∴∠BEC+∠FGE=180°( ).
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