名校
1 . 【选修4-1:几何证明选讲】
![](https://img.xkw.com/dksih/QBM/2017/9/28/1783842664185856/1783942361972736/STEM/1044fd209da844d4be7390ba219d64ae.png?resizew=236)
如图,
的外接圆的切线AE与BC的延长线相交于点E,∠BAC的平分线与BC相交于点D,求证:
(1)EA=ED;
(2)
.
![](https://img.xkw.com/dksih/QBM/2017/9/28/1783842664185856/1783942361972736/STEM/1044fd209da844d4be7390ba219d64ae.png?resizew=236)
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
(1)EA=ED;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57cc3a14320beb884f03069e0b84fbbd.png)
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2 . 如图,
为
的直径,
为
上一点,过
作
的切线交
的延长线于点
,
若
,求证:
.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236c134aad7d9a21c49c07e924b9a531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5181b97a7e43959b8455680157c3b644.png)
![](https://img.xkw.com/dksih/QBM/2017/6/1/1699468324864000/1700210515853312/STEM/a34bb7f41b59438aa3aae4fcafecc7fb.png?resizew=144)
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名校
3 . 如图,
是半圆周上的两个三等分点,直径
,垂足为
与
相交于点
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354e1b631c1f46ed3aa1ce42fe498896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c32c70a4c5704c4bc4b18d87fbd118b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9289bfc49ba4165089dbede16813bbd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/2017/4/28/1675462539886592/1737682488197120/STEM/1b39b1f2db31426f9501fb7188af3623.png?resizew=182)
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4 . A.如图所示,
是园
内两条弦
和
的交点,过
延长线上一点
作圆
的切线
,
为切点,已知
求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42453c833ec3a7ce4872fec650cd9d7.png)
![](https://img.xkw.com/dksih/QBM/2017/3/19/1647033146163200/1647946591010816/STEM/56225fe9c4bc4c679860b36e94307e77.png?resizew=183)
B.已知矩阵
,
.求矩阵
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e08ea53af50d2e51b060f21d22d17f4.png)
C.在平面直角坐标系
中,直线
的参数方程为
(
为参数),以坐标原点
为极点,
轴正半轴为极轴的极坐标系中,曲线
的极坐标方程为
,已知直线
与曲线
相交于
两点,求线段
的长.
D.已知
都是正数,且
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff89d2ee12c1cd886422896208f44fdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42453c833ec3a7ce4872fec650cd9d7.png)
![](https://img.xkw.com/dksih/QBM/2017/3/19/1647033146163200/1647946591010816/STEM/56225fe9c4bc4c679860b36e94307e77.png?resizew=183)
B.已知矩阵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad34e36c307e8ca0a490adfd34566a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05593a9391c462e0e2538844f78e3b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e4cddb450523d6ab69b9080aeb0d5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8fa78398b62e6805404f020a0d00e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e08ea53af50d2e51b060f21d22d17f4.png)
C.在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37686fd77607f96d259cfd117c863bf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bddf0b3db29426b5f1c396736b7f667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
D.已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2edfccf9159bb4010669e938f788149b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56dcbfa0d3655f4c20db4363f69e6c36.png)
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5 . 如图所示,
为
斜边
边上的中线,
,
,连接
交
于点
,
,
.求证:
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472519102464/1619472519667712/STEM/ee65ac7e5fc04485a9011cf8b6e685c1.png)
(1)
∽
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6d946ec5bc75341f7e5fe400054464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c3f12229161dd431f7ffdbe7bcfe0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472519102464/1619472519667712/STEM/ee65ac7e5fc04485a9011cf8b6e685c1.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f90188bd10aabf5f6faf7dd4bdf2ae.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ce838f38419e8781d63b3417cac5e4.png)
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6 . 如图所示,
是
的直径,弦
于点
,
,
,求
的半径.
![](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/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b49c2d3750b2d5edf783374a51e481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e9da3d3086fc3673e3b136d4e6fc35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472216219648/1619472216875008/STEM/8c5e1512409342fd97d6cdab7af57e45.png)
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7 . 如图所示,
内接于圆,
切圆于
是
延长线上一点,连接
交
于
点.若
是
的中点.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354e1b631c1f46ed3aa1ce42fe498896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d3f0454a0d7985a9e88d85f13ab9cb.png)
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472216219648/1619472216694784/STEM/5143774fbc6d4441966f6f0a4ca9fbb2.png)
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8 . 如图所示,在
中,
为
的内心,
交
于
,交
外接圆于
.
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472216219648/1619472216768512/STEM/ebcb7c596b434533a33f29987c26af86.png)
求证:(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42774a918f52ac8aa8b1f5b78a676f17.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/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472216219648/1619472216768512/STEM/ebcb7c596b434533a33f29987c26af86.png)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4aa079ece53f5de96b5367bd343dd53.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c022749480861449780ee16959886a5.png)
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9 . 如图所示,过圆
外一点
作它的一条切线,切点为
,过
点作直线
垂直于直线
,垂足为
.
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472216219648/1619472216842240/STEM/1da16b8163464d088175e61cd5d8bb4a.png)
(1)证明:
;
(2)
为线段
上一点,直线
垂直于直线
,且交圆
于
点.过
点的切线交直线
于
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472216219648/1619472216842240/STEM/1da16b8163464d088175e61cd5d8bb4a.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee1b8f3bb4a294b4cc67154688304f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279563c3c055777ce1aa369a2ef54aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f52ef170c9bebf83641eaa4b406b69.png)
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10 . 如图所示,已知
是
的直径,
为圆上任意一点,过
的切线分别与过
两点的切线交于
.求证:
.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45987c98a4df7b2a736cc7650da01cf4.png)
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472216219648/1619472216793088/STEM/14dab56eb62f4ffbac5bbd0f1c0c6859.png)
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