【选修4-1】几何证明选讲
在
中,
的平分线交
于点
,
的平分线交
于点
.
求证:
.
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6397f5a154ab2a7026357137853a9b94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c267a7a677046db99ce9a6bca655c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1000289eb51626b34b586eb9595aaafb.png)
![](https://img.xkw.com/dksih/QBM/2016/5/18/1572636717309952/1572636723740672/STEM/9a23a2b47597423fac095d7bbe830e0e.png)
更新时间:2016-12-04 07:20:30
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【知识点】 几何证明选讲
相似题推荐
解答题-问答题
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较易
(0.85)
真题
【推荐1】如图,CD为△ABC外接圆的切线,AB的延长线交直线CD于点D,E、F分别为弦AB与弦AC上的点,
且BC
AE=DC
AF,B、E、F、C四点共圆.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/3d3c104e-8ea2-4617-b8c1-2376e90b2319.png?resizew=149)
(Ⅰ)证明:CA是△ABC外接圆的直径;
(Ⅱ)若DB=BE=EA,求过B、E、F、C四点的圆的面积与△ABC外接圆面积的比值.
且BC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97ec04a1aa7ac6fce72d589864940a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97ec04a1aa7ac6fce72d589864940a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/3d3c104e-8ea2-4617-b8c1-2376e90b2319.png?resizew=149)
(Ⅰ)证明:CA是△ABC外接圆的直径;
(Ⅱ)若DB=BE=EA,求过B、E、F、C四点的圆的面积与△ABC外接圆面积的比值.
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解答题-问答题
|
较易
(0.85)
【推荐2】已知
点在
直径
的延长线上,
切
于
点,
是
的平分线且交
于点
,交
于点
.
![](https://img.xkw.com/dksih/QBM/2016/6/22/1572790438600704/1572790445056000/STEM/0a4bba9e1e8b4327bc592e977e5288fd.png)
(1)求
的度数;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e763a7d8149039c8107d6bc73deec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2016/6/22/1572790438600704/1572790445056000/STEM/fb61d38d83f94e0aac64f6ed64f8ddf1.png)
![](https://img.xkw.com/dksih/QBM/2016/6/22/1572790438600704/1572790445056000/STEM/af27c83e33764ac0afe542d50f04a23b.png)
![](https://img.xkw.com/dksih/QBM/2016/6/22/1572790438600704/1572790445056000/STEM/0a4bba9e1e8b4327bc592e977e5288fd.png)
(1)求
![](https://img.xkw.com/dksih/QBM/2016/6/22/1572790438600704/1572790445056000/STEM/ca31d794eed64ab4a0f27aece628c8bf.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/6/22/1572790438600704/1572790445056000/STEM/3dc5844e456a4a7c90a428a59a3faa30.png)
![](https://img.xkw.com/dksih/QBM/2016/6/22/1572790438600704/1572790445056000/STEM/c1b25dfc10ed4d76842d733b340adeb4.png)
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