如图,
、
均为等边三角形,连接
、
交于点O,
与
交于于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/18958181-37d2-4b5f-86d8-1239e1828aa8.png?resizew=157)
(1)求证:
.
(2)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/18958181-37d2-4b5f-86d8-1239e1828aa8.png?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e8a0c5f4a95fb2699860fd3f638737e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
更新时间:2023-10-09 17:18:34
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】(1)如图,小莉画了一个角∠MON=80°,点A、B分别在射线OM、ON上移动,△AOB的角平分线AC与BD交于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/28d07318-8150-41d3-9c0d-9582c778da6f.png?resizew=156)
试问:随着点A、B位置的变化,∠APB的大小是否会变化?若保持不变,请求出∠APB的度数;若发生变化,求出变化范围.
(2)聪明的小莉想出了一个画30°角的方法:①画两条相交的直线OX、OY,使∠XOY=60°,②在射线OX、OY上分别再任意取A、B点,③作∠ABY的平分线BD,BD的反向延长线交∠OAB的平分线于点C,则∠C就是30°的角.你认为小莉的方法正确吗?请你说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/28d07318-8150-41d3-9c0d-9582c778da6f.png?resizew=156)
试问:随着点A、B位置的变化,∠APB的大小是否会变化?若保持不变,请求出∠APB的度数;若发生变化,求出变化范围.
(2)聪明的小莉想出了一个画30°角的方法:①画两条相交的直线OX、OY,使∠XOY=60°,②在射线OX、OY上分别再任意取A、B点,③作∠ABY的平分线BD,BD的反向延长线交∠OAB的平分线于点C,则∠C就是30°的角.你认为小莉的方法正确吗?请你说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/efd79cb3-be08-4aab-b7e4-3fe68d4631d3.png?resizew=163)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图1,
,直线
与
、
相交于点
、
,
平分
,
平分
.
;
(2)如图2,
为
、
之间一点(
),若
,求
的度数;
(3)若
为直线
下方一点,
,
为直线
右侧一点,满足
,则
、
、
之间满足的数量关系是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6a23d521606a35298bbf147f7f830c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f68e4414c9ab464bf433385c03705f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27169ea82d324b211d195b1d85193f4d.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2712220207d898b38e2568ba51ec4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c15a1bd19dade575fd1aa057f0ca54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a742abf1b0702125a0c77cbfbef118ca.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c2067bf2b77ef799a6ddabdfb5f356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c07ec7c27aac3e039498c49213af7625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db6d0564be83500c8cd9d1211cf686e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b2828cc968e9a6eb1cdb89878de09d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6a23d521606a35298bbf147f7f830c.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知正方形
中,点
是
上的一点,连结
,以
为一边,在
的上方作正方形
,连结
.求证:
.
![](https://img.xkw.com/dksih/QBM/2014/2/7/1573703166361600/1573703172521984/STEM/3e2102a7afc448a2be0f4ee80e945d1b.png)
![](https://img.xkw.com/dksih/QBM/2014/2/7/1573703166361600/1573703172521984/STEM/b1bc176c2e13400b9a7d0f342971cc80.png)
![](https://img.xkw.com/dksih/QBM/2014/2/7/1573703166361600/1573703172521984/STEM/60c3001081ae46b8b69958807789bac3.png)
![](https://img.xkw.com/dksih/QBM/2014/2/7/1573703166361600/1573703172521984/STEM/33adb7bfeaf943958569e9405cbae4bc.png)
![](https://img.xkw.com/dksih/QBM/2014/2/7/1573703166361600/1573703172521984/STEM/33adb7bfeaf943958569e9405cbae4bc.png)
![](https://img.xkw.com/dksih/QBM/2014/2/7/1573703166361600/1573703172521984/STEM/33adb7bfeaf943958569e9405cbae4bc.png)
![](https://img.xkw.com/dksih/QBM/2014/2/7/1573703166361600/1573703172521984/STEM/ee88bba4588d40c1a03188b57beeedbf.png)
![](https://img.xkw.com/dksih/QBM/2014/2/7/1573703166361600/1573703172521984/STEM/e1555c93ce0945b19ca8209a688099cf.png)
![](https://img.xkw.com/dksih/QBM/2014/2/7/1573703166361600/1573703172521984/STEM/326bcf45b47e45eb8a6f4a425dbbc188.png)
![](https://img.xkw.com/dksih/QBM/2014/2/7/1573703166361600/1573703172521984/STEM/359ff379e078411aa9beb65d8e196d81.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】请补充完成以下证明过程:
如图,已知在等边三角形
中,D、E分别是
上的点,且
.
求证:
.
证明:
为等边三角形,(已知),
( ).
( ).
(已知),
( ).
.
如图,已知在等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b33f5b71039c35ac5e93795e254f9.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea33d6f0bd0fea02c3e58f0983fe753b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5112ba7d28a4d5155c41f9d886b1059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b6cf4a15debec25bb89083b846509a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e98427f67cd14eadbb3ca55098ffe5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e354ba90530aff8ba52e570e6aa64cf.png)
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