如图,已知
,
.请指出
与
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43c10ef52c84726a0a1e9a11c660f921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://img.xkw.com/dksih/QBM/2021/7/19/2767493240045568/2788824908300288/STEM/7686444e-44ef-48bd-9b6c-0083ef55d6f4.png)
更新时间:2021-08-18 14:21:42
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解答题-问答题
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解题方法
【推荐1】如图①,已知直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,且
和
,
分别交于A,B两点,
和
,
分别交于C,D两点,点P在线段AB上,∠ACP=∠1,∠BDP=∠2,∠CPD=∠3.
(2)试找出∠1,∠2,∠3之间的数量关系,并说明理由.
(3)应用(2)中的结论解答下面的问题:
如图②,点A在B的北偏东40°的方向上,在C的北偏西45°的方向上,求∠BAC的度数.
(4)如果点P在直线
上且在线段AB外侧运动(点P和A,B两点不重合),其他条件不变,试探究∠1,∠2,∠3之间的关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f2813ee8f26cca880b6427f5f545d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
(2)试找出∠1,∠2,∠3之间的数量关系,并说明理由.
(3)应用(2)中的结论解答下面的问题:
如图②,点A在B的北偏东40°的方向上,在C的北偏西45°的方向上,求∠BAC的度数.
(4)如果点P在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
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解答题-问答题
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较易
(0.85)
【推荐2】如图,在△ 𝐴𝐵𝐶中,𝐶𝐷⊥𝐴𝐵,垂足为 D,点 E 在 BC 上,𝐸𝐹⊥𝐴𝐵,垂足为 F,∠1=∠2.
![](https://img.xkw.com/dksih/QBM/2020/3/27/2428772409901056/2429965658783745/STEM/1350c66c8551469e97ac22640ebd898b.png?resizew=131)
(1)试说明𝐷𝐺//𝐵𝐶的理由;
(2)如果∠𝐵 = 54°,且∠𝐴𝐶𝐷 = 35°,求∠3的度数.
![](https://img.xkw.com/dksih/QBM/2020/3/27/2428772409901056/2429965658783745/STEM/1350c66c8551469e97ac22640ebd898b.png?resizew=131)
(1)试说明𝐷𝐺//𝐵𝐶的理由;
(2)如果∠𝐵 = 54°,且∠𝐴𝐶𝐷 = 35°,求∠3的度数.
您最近一年使用:0次