1 . 选修4-1:几何证明选讲:
如图,过圆
外一点
作一条直线与圆
交于
两点,且
,作直线
与圆
相切于点
,连结
交
于点
,已知圆
的半径为2,
.
![](https://img.xkw.com/dksih/QBM/2016/11/7/1573129983336448/1573129989980160/STEM/bf2a0ca8c8564a44a01cb4ee917a5f59.png)
(1)求
的长;
(2)求
的值.
如图,过圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed875fbe05aaeca4681a0864c4c9b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d4aaec5d8780821374d920d1d958d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9be0fc7145f7f7ba054d3ad5f5acd9bd.png)
![](https://img.xkw.com/dksih/QBM/2016/11/7/1573129983336448/1573129989980160/STEM/bf2a0ca8c8564a44a01cb4ee917a5f59.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de6f00fb37cbf8531f0612256cdc8e8f.png)
您最近一年使用:0次
2 . 选修4-1:几何证明选讲
如图,
与
都是以
为斜边的直角三角形,
为线段
上一点,
平分
,且
.
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/d0e6e67d7ddb4129bb73170cef241f4b.png)
(1)证明:
四点共圆,且
为圆心;
(2)
与
相交于点
,若
,求
之间的距离.
如图,
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/b7170dad9ff94080b2491fc4b2e11c3a.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/719696643b8649b3a210821b3873efdd.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/50ff2f2140fa44ce9a4db5b4b64dea3f.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/b0222bfb74d04b999c2a960eaf7e0d20.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/50ff2f2140fa44ce9a4db5b4b64dea3f.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/a7a8f413dc974dc592c5744e802ffbb8.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/90c98afdd1e243a98ba5e7e5852b0bbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a12de742960351a60c6576f2887586.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/d0e6e67d7ddb4129bb73170cef241f4b.png)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/86e5f82337c6419a9e8a57c060352a03.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/b0222bfb74d04b999c2a960eaf7e0d20.png)
(2)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/915fd795b9c44eebae1ad1f11ab38afd.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/a7a8f413dc974dc592c5744e802ffbb8.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/f9932e3eedfc47589f5cfbc8bf67a3a5.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/4377f8378bf8465bac5f73ddbdb04e28.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573124229095424/1573124235526144/STEM/d0c94cd71a4a478eb260060ad6670fab.png)
您最近一年使用:0次
2016-12-04更新
|
93次组卷
|
2卷引用:2017届河北唐山市高三上学期调研统考一数学(理)试卷
3 . 选修4-1:几何证明选讲
如图,
是
的直径,
为
的切线,点
为
上不同于
、
的一点,
为
的平分线,且分别与
交于
,与
交于
,与
交于
,连接
、
.
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573118771642368/1573118777868288/STEM/f733e75dc7ad4d0f9e3fc0098f87da84.png)
(Ⅰ)求证:
;
(Ⅱ)求证:
.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6062582a0a1679aa777451f25008411d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573118771642368/1573118777868288/STEM/f733e75dc7ad4d0f9e3fc0098f87da84.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9161ed2efa3bc2130a7ce88161c72c1c.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddc2ca8b661465c6896ba52c2a7905e.png)
您最近一年使用:0次
2016-12-04更新
|
106次组卷
|
2卷引用:2017届辽宁庄河市高级中学高三9月月考数学(理)试卷
4 . 如图,直线
与圆切于点
,过
作直线与圆交于
两点,点
在圆上,且
.
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573111429447680/1573111435993088/STEM/f90ae4f52cef411aa76787b279f46c88.png?resizew=185)
(1)求证:
;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b70faeb8cf6c8bdb9aab3a006b4c974.png)
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573111429447680/1573111435993088/STEM/f90ae4f52cef411aa76787b279f46c88.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0debf7dd6e6a8fd14253cb1a4a3bc59.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8edaed541a0f4ec6c8c7f22f37639796.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0a538a73dd30cfcb47455e37bfb4cc.png)
您最近一年使用:0次
2016-12-04更新
|
390次组卷
|
5卷引用:2017届山西临汾一中高三10月月考数学(理)试卷
5 . 选修4-1:几何证明选讲
如图,已知
为圆
的直径,
,
是圆
上的两个点,
是劣弧
的中点,
⊥
于
,
交
于
,交
于
.
![](https://img.xkw.com/dksih/QBM/2016/11/1/1573105381957632/1573105388265472/STEM/6b9a7851a31146389cd3d77b76ef8d00.png)
(1)求证:
;
(2)求证:
.
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/11/1/1573105381957632/1573105388265472/STEM/6b9a7851a31146389cd3d77b76ef8d00.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a568993b1632e5d8fbc202352fb691df.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec61091a2ac1d2075dfd325c91c8290b.png)
您最近一年使用:0次
6 . 选修4-1:几何证明选讲
已知四边形
为圆
的内接四边形,且
,其对角线
与
相交于点
,过点
作圆
的切线交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2016/10/26/1573096153595904/1573096159936512/STEM/29d386117f8345aa8f34561ae58d54b9.png)
(1)求证:
;
(2)若
,求证:
.
已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2016/10/26/1573096153595904/1573096159936512/STEM/29d386117f8345aa8f34561ae58d54b9.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773aa712639a27d0670e57b970f57fab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5295ea3130e7248d1a11d8500b081721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
您最近一年使用:0次
2016-12-04更新
|
722次组卷
|
2卷引用:2017届河北衡水中学高三上学期调研三考数学(理)试卷
7 . 选修4-1:几何证明选讲
如图,圆周角
的平分线与圆交于点
,过点
的切线与弦
的延长线交于点
,
交
于点
.
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273014292480/1572273020624896/STEM/250ee19ea09e4222bacc8433628290df.png)
(1)求证:
;
(2)若
,
,
,
四点共圆,且
,求
.
如图,圆周角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e57541260bfadf7624c86769eec0fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0b669ef4514f24ee09adeff7f41238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0b669ef4514f24ee09adeff7f41238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9febb0e53890d2fb72fdfd7f0aa88acc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ebbd866e455cf80ea669c9f56f792c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b693717f525facc79b9a500ed998b109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588a2119bc5e8cdf4731828b195a7892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2391c0e2fc44598610d519dacb778062.png)
![](https://img.xkw.com/dksih/QBM/2015/10/28/1572273014292480/1572273020624896/STEM/250ee19ea09e4222bacc8433628290df.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa9132693acc1c5c9f9b50445cf98e2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0b669ef4514f24ee09adeff7f41238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ebbd866e455cf80ea669c9f56f792c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca66a268d6f46e0e9d5d9151b785be60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2391c0e2fc44598610d519dacb778062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14da8b9947feb556eb2669fcb6ba6277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e57541260bfadf7624c86769eec0fc1.png)
您最近一年使用:0次
2016-12-04更新
|
90次组卷
|
3卷引用:2016届吉林省实验中学高三上学期第一次模拟理科数学试卷1
8 . 选修4-1:几何证明选讲
如图,
是
的直径,
是
的切线,
交
于点
.
![](https://img.xkw.com/dksih/QBM/2016/10/26/1573095472734208/1573095478673408/STEM/478a4dd01e694ac08aee8b9b22a56c3d.png)
(1)过
作
的切线,交
与点
,证明:
是
的中点;
(2)若
,求
的大小.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2016/10/26/1573095472734208/1573095478673408/STEM/478a4dd01e694ac08aee8b9b22a56c3d.png)
(1)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d703388e908f0cc99b37c176c7181fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
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2016-12-04更新
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72次组卷
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4卷引用:2017届广西南宁二中等校高三8月联考数学(理)试卷1
9 . 选修4-1:几何证明选讲
如图,过圆
外—点
作圆的切线
,切点为
,割线
、割线
分别交圆
于
与
、
与已知
的垂直平分线
与圆
相切.
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573080591360000/1573080597676032/STEM/d3f5948a8c624c4abb6ab3f1229a1bf4.png)
(1)求证:
;
(2)若
,求
的长.
如图,过圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573080591360000/1573080597676032/STEM/d3f5948a8c624c4abb6ab3f1229a1bf4.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573080591360000/1573080597676032/STEM/8aeb519517d44d1f9543eea5aa4ed3a3.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573080591360000/1573080597676032/STEM/62c0c1c95ff844e9ab4a5fe31c9d665f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
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10 . 选修4-1:几何证明选讲
如图,等边三角形
内接于圆
,以
为切点的圆
的两条切线交于点
,
交圆
于点
.
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/81a2034bb5884dbb8fb950289d74455b.png)
(1)求证:四边形
为菱形;
(2)若
,求等边三角形
的面积.
如图,等边三角形
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/b14f487803734a408ef11a0a24ab6cb3.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/d8c5684dcc7844df9dcdca6cc57f4e99.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/b9aaa9937d4947ac8e9fdebd4a81c03e.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/d8c5684dcc7844df9dcdca6cc57f4e99.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/0d182b60a23f4c2dbfd61088479c4ccb.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/7b36e47cb3b449099c42caa838f69826.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/d8c5684dcc7844df9dcdca6cc57f4e99.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/da51e06ba72147f0b7cf56d180428ad0.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/81a2034bb5884dbb8fb950289d74455b.png)
(1)求证:四边形
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/aae1360d683b409d8355fbf24ba4bec4.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/6be006f766f04a38b903a6283d9e7b33.png)
![](https://img.xkw.com/dksih/QBM/2016/10/18/1573077170307072/1573077331746816/STEM/b14f487803734a408ef11a0a24ab6cb3.png)
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