如图所示,在△ ABC中,
,
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d1fc6a7e43712a09db5231d8f260b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6652e729301d2dfb5770b29e035d96b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1cc7a4c9096e13141c51d8d95ffbc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c1137a434344758745507db1401da0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/940936b3-b50e-428d-a28b-accd012de298.png?resizew=105)
更新时间:2020-04-21 14:50:27
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【推荐1】如图,在⊙O中,AB为直径,延长AB至点P,点C是⊙O上一点,连接PC并延长交⊙O于D.
(1)若
=1∶2∶3,圆的半径为2,求弦AD的长;
(2)给出下列信息:①DC=BP;②PC=OB;③∠AOD=3∠P.请在上述3个信息中选择其中一个信息作为条件,一个信息作为结论组成一个真命题,并说明理由.你选择的条件是 ,结论是 (只要填写序号).
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1f93a8d5ae26f6bf129a29458eb6a65.png)
(2)给出下列信息:①DC=BP;②PC=OB;③∠AOD=3∠P.请在上述3个信息中选择其中一个信息作为条件,一个信息作为结论组成一个真命题,并说明理由.你选择的条件是 ,结论是 (只要填写序号).
![](https://img.xkw.com/dksih/QBM/2021/10/9/2825870276247552/2827534590910464/STEM/1cf5940b-3322-40c5-a6f4-119e0fdfaf75.png)
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【推荐2】如图,在ΔABC中,AB=AC,BC=12,∠BAC=120°,AB的垂直平分线交BC边于点E,AC的垂直平分线交BC边于点N.
(1)求△AEN的周长;
(2)判断ΔAEN的形状并说明理由.
(1)求△AEN的周长;
(2)判断ΔAEN的形状并说明理由.
![](https://img.xkw.com/dksih/QBM/2019/5/6/2197841603698688/2198301589684224/STEM/79f266e5e31644068f0e0c260bdd682a.png?resizew=254)
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【推荐1】如图在△ABC中,
,D是BC的中点,
,
,点E、F分别为垂足.
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974505876520960/2975508707246080/STEM/e04422a1-c656-4365-9888-23863a7b0518.png?resizew=258)
(1)求证:△DEF是等腰三角形.
(2)当
的度数为______时,△DEF是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974505876520960/2975508707246080/STEM/e04422a1-c656-4365-9888-23863a7b0518.png?resizew=258)
(1)求证:△DEF是等腰三角形.
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
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【推荐2】如图,和
中,
,
,
,
、
交于M.
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5071953255f6434eaefeab7176372564.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d15b7c09aac2543b8615aca6b62ee36d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5212952ab2345fbacd8e222cb393305d.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5071953255f6434eaefeab7176372564.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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【推荐1】如图,在
中,边
的垂直平分线交
,
于点
,
,边
的垂直平分线交
,
于点
,
,
的周长是12.
的长.
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8106ba1fe80682061a208751f9dba3ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0fc232acd89fc499de346969ce8ced1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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【推荐2】如图,
,
交于点F,点C在线段
上,且
,
,
,连接
,
.
![](https://img.xkw.com/dksih/QBM/2023/12/16/3390297264996352/3411565140877312/STEM/8a145ddb9bb845e481ffbd43fff0141d.png?resizew=145)
(1)求证:
;
(2)若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1120e471627069e78a6733af07687684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfa223e7b272346649538457c976864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2023/12/16/3390297264996352/3411565140877312/STEM/8a145ddb9bb845e481ffbd43fff0141d.png?resizew=145)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ec435aa1401dbce7863b531bf2f3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
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