如图,点E在CD上,点F在BA上,G是AD延长线上一点,
![](https://img.xkw.com/dksih/QBM/2012/3/5/1573350640803840/1573350663667712/STEM/937c9b0e-1629-4b4a-809f-b3b618803716.png?resizew=196)
(1)若∠A=∠1,则可判断____∥____,因为_____________;
(2)若∠1=∠_____,则可判断AG∥BC,因为_______________;
(3)若∠2+∠______=180°,则可判断CD∥AB,因为______________;
![](https://img.xkw.com/dksih/QBM/2012/3/5/1573350640803840/1573350663667712/STEM/937c9b0e-1629-4b4a-809f-b3b618803716.png?resizew=196)
(1)若∠A=∠1,则可判断____∥____,因为_____________;
(2)若∠1=∠_____,则可判断AG∥BC,因为_______________;
(3)若∠2+∠______=180°,则可判断CD∥AB,因为______________;
11-12七年级·全国·假期作业 查看更多[3]
更新时间:2016-12-05 07:33:01
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解答题-证明题
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适中
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【推荐1】完成下列证明过程,并在括号内填上依据.
如图,点E在AB上,点F在CD上,∠1=∠2,∠B=∠C,求证AB∥CD.
![](https://img.xkw.com/dksih/QBM/2021/7/6/2758453903712256/2822923538980864/STEM/ecb928c9fd0c44d297d9b3aa24b72c0c.png?resizew=163)
证明:∵∠1=∠2(已知),∠1=∠4
∴∠2= (等量代换),
∴ ∥BF( ),
∴∠3=∠ ( ).
又∵∠B=∠C(已知),
∴∠3=∠B
∴AB∥CD( ).
如图,点E在AB上,点F在CD上,∠1=∠2,∠B=∠C,求证AB∥CD.
![](https://img.xkw.com/dksih/QBM/2021/7/6/2758453903712256/2822923538980864/STEM/ecb928c9fd0c44d297d9b3aa24b72c0c.png?resizew=163)
证明:∵∠1=∠2(已知),∠1=∠4
∴∠2= (等量代换),
∴ ∥BF( ),
∴∠3=∠ ( ).
又∵∠B=∠C(已知),
∴∠3=∠B
∴AB∥CD( ).
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解答题-问答题
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【推荐2】如图,CD是△ABC的高,点E、F、G分别在BC、AB、AC上,且EF⊥AB,
![](https://img.xkw.com/dksih/QBM/2019/4/8/2177934905270272/2179326518607872/STEM/ac0eeb0c8fba47cbb4efe5ffe64a7a5f.png?resizew=178)
(1)在△ABC中,AC=4,BC=5,写出AB的取值范围;
(2)DG∥BC.试判断∠1、∠2的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2019/4/8/2177934905270272/2179326518607872/STEM/ac0eeb0c8fba47cbb4efe5ffe64a7a5f.png?resizew=178)
(1)在△ABC中,AC=4,BC=5,写出AB的取值范围;
(2)DG∥BC.试判断∠1、∠2的数量关系,并说明理由.
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【推荐1】如图,已知
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(2)若
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解答题-证明题
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适中
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【推荐2】如图,
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解答题-问答题
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适中
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【推荐1】如图,已知直线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e354c90834bf966f423ece2d756f2d13.png)
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解答题-证明题
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适中
(0.65)
【推荐2】已知:如图,FA⊥AC,EB⊥AC,垂足分别为A、B,且∠BED+∠D=180°.
![](https://img.xkw.com/dksih/QBM/2019/1/3/2110930017378304/2113372744712192/STEM/83aeca7e66e64bf993584aed3a297ff1.png?resizew=175)
求证:AF∥CD.
![](https://img.xkw.com/dksih/QBM/2019/1/3/2110930017378304/2113372744712192/STEM/83aeca7e66e64bf993584aed3a297ff1.png?resizew=175)
求证:AF∥CD.
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