如图,在
中,
分别是
及
的外角
的平分线,且
交
于点
交
于点
,且
.
(1)求证:
是
的中点;
(2)若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f128427e0e7632e6394dc8896d45e45a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1364a92bc6d25d0685a4917f0592783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/9/c6811d28-10c4-48ff-b1aa-0bf2e0f5ecdc.png?resizew=146)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640e9e7c56e8eeda044fb55396088816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e8c257f5615d30660cef4157c6b273.png)
更新时间:2023-07-06 15:37:56
|
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解答题-问答题
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较易
(0.85)
【推荐1】已知
为直线
上的一点,
是直角,
平分
.
(1)如图1,若
,则
;
(2)当射线
绕点
逆时针旋转到如图2的位置时,
与
之间有何数量关系?请说明理由.
(3)在图3中,若
,在
的内部是否存在一条射线
,使得
?若存在,请求出
的度数;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a91deaedc779200a8b20a3f9a440ba89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7c903121c158dafe5e7f3712897ed8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b723421b10b3735be77e1c79fa1425.png)
(3)在图3中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b0a3d78cd6fb556eb353a6c7338e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/072436a7e9cc32add4ebdba9ae0bce4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://img.xkw.com/dksih/QBM/2021/11/24/2858119021789184/2866149783109632/STEM/f1883375-8f1a-4404-97c8-363efcbd9f3c.png?resizew=475)
您最近一年使用:0次
解答题-问答题
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【推荐2】已知∠AOB,过顶点O作射线OP,若∠BOP=
∠AOP,则称射线OP为∠AOB的“二分线”,因此∠AOB的“二分线”有两条,如图1,射线OP1,OP2都是∠AOB的“二分线”.
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896518781591552/2960647588306944/STEM/5c7c8728-c4a0-444a-9cf4-cca2fd248396.png?resizew=613)
(1)已知射线OP是∠AOB的“二分线”,且∠AOB=30°,则∠BOP的度数是_________.
(2)如图2,O是直线MN上的一点,OB、、OA分别是∠MOP和∠PON的平分线.已知∠MOB=30°,请说明射线OP是∠AOB的一条“二分线”.
以下是小慧同学的解答过程,请你帮她将解答过程补充完整:
∵OB、OA分别是∠MOP和∠PON的平分线,
∴
________,
.
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f33c6c0436397d2fe1f4f572b68228b.png)
∵∠MOB=30°,
∴∠BOP=30°,∠AOP=_________°.
∴
_________,
即射线OP是∠AOB的一条“二分线”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896518781591552/2960647588306944/STEM/5c7c8728-c4a0-444a-9cf4-cca2fd248396.png?resizew=613)
(1)已知射线OP是∠AOB的“二分线”,且∠AOB=30°,则∠BOP的度数是_________.
(2)如图2,O是直线MN上的一点,OB、、OA分别是∠MOP和∠PON的平分线.已知∠MOB=30°,请说明射线OP是∠AOB的一条“二分线”.
以下是小慧同学的解答过程,请你帮她将解答过程补充完整:
∵OB、OA分别是∠MOP和∠PON的平分线,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633f0b0b0427f7c88405a2975b4e107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1869437fe06437093aa13877f7f76626.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f33c6c0436397d2fe1f4f572b68228b.png)
∵∠MOB=30°,
∴∠BOP=30°,∠AOP=_________°.
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171a8d3e5fea97a0870a00e96696b5b8.png)
即射线OP是∠AOB的一条“二分线”.
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解答题-问答题
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【推荐1】如图,在四边形
中,
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(2)若
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交
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名校
【推荐2】如图,已知点
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上,
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解答题-证明题
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(1)求证:△DEF是等腰三角形;
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您最近一年使用:0次