如图,已知等腰三角形ABC.
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991168480468992/2995554596839424/STEM/a8ee1718-9ab8-4ce5-9553-0f5ca79f623b.png?resizew=238)
(1)尺规作图:作
,使得
,且点D不与点B重合,连接CD(作图需保留痕迹,不写作法);
(2)证明:四边形ABCD是菱形.
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991168480468992/2995554596839424/STEM/a8ee1718-9ab8-4ce5-9553-0f5ca79f623b.png?resizew=238)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c9491f900cc3cd4a80bd259c4717fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
(2)证明:四边形ABCD是菱形.
更新时间:2022-06-06 16:14:20
|
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,点
在
上,已知
,
平分
,
平分
,请说明
的理由:
(_________)
(_________)
所以
(_________)
因为
平分
,
所以
_________(_________)
因为
平分
,
所以
_________,
得
(_________)
所以
(_________)
![](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/f7b88999a3cc54327ce9efbad51e9974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d34b2c6c1379ea4968962e96eba6cd18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96dbf32210f81599fa2a02983ac84cac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dccfdb1e0326114a5b0d3c7f25d074e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7b88999a3cc54327ce9efbad51e9974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddce3f5ddc9d479f8772735d28e0da0.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21a4f04b3c8c02b57b884f8b1a9243ed.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d34b2c6c1379ea4968962e96eba6cd18.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d345197029bf99ba296bb5fc36222e2c.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96dbf32210f81599fa2a02983ac84cac.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38011a315de7ee360444933850a015a1.png)
得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dccfdb1e0326114a5b0d3c7f25d074e.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,已知点O在直线
上,射线
平分
,过点O作
,过点D作
射线
于点F,连接
.
(1)请判断
与
是否相等,并说明理由;
(2)若
,试判断
与
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(1)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
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(2)若
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解答题-证明题
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适中
(0.65)
【推荐1】已知,如图,在四边形
中,
,且
平分
,点O是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/0616c0e0-7396-4937-910a-53c0333df0c6.png?resizew=128)
(1)求证:
平分
;
(2)求证:
.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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(1)求证:
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(2)求证:
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解答题-证明题
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适中
(0.65)
【推荐2】已知,
,
,
交于点
.
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(1)如图1,求证:
;
(2)延长
交于点
,请直接写出图2中的所有全等三角形.
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(1)如图1,求证:
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(2)延长
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解答题-问答题
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适中
(0.65)
【推荐1】如图,在
中,∠C=90°,AB的垂直平分线交BC于D,连接AD.
(1)若
的周长为16,AB=12,求
的周长;
(2)若AD将∠CAB分成两个角,且∠CAD:∠DAB=2:5,求∠ADC的度数.
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(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
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(2)若AD将∠CAB分成两个角,且∠CAD:∠DAB=2:5,求∠ADC的度数.
![](https://img.xkw.com/dksih/QBM/2020/12/4/2606661961760768/2613562838196224/STEM/8c07a5d267b741068121c6af18a7f496.png?resizew=136)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,已知在等腰
中,
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(1)求证:
;
(2)若
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的长.
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,矩形
的对角线
,
相交于点
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
.
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(1)求证:四边形
是菱形;
(2)若
,
,则菱形
的面积为________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd3d63521c5659bc78da60b2b482c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784644336f2417214eeace1592223b31.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/856b6286-ec6e-49c5-99e7-9571b22ec3e2.png?resizew=230)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a6e2ab0a2c893dc495df33e5ee092d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a6e2ab0a2c893dc495df33e5ee092d.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图所示,在梯形ABCD中,AD∥BC,∠BDC=90°,E为DC上一点,∠BDE=∠DBC.
![](https://img.xkw.com/dksih/QBM/2014/2/26/1573709931839488/1573709937426432/STEM/85e2fa86e3e24557ad4c39f73a7f6dea.png)
(1)求证:DE=CE;
(2)若
,试判断四边形ABED的形状,并说明理由.
![](https://img.xkw.com/dksih/QBM/2014/2/26/1573709931839488/1573709937426432/STEM/85e2fa86e3e24557ad4c39f73a7f6dea.png)
(1)求证:DE=CE;
(2)若
![](https://img.xkw.com/dksih/QBM/2014/2/26/1573709931839488/1573709937426432/STEM/6974a27532ca470ab5baf1ff70588451.png)
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