题型:解答题
难度:0.4
引用次数:515
题号:9469296
如图,
中,
,
,
为
内部一点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc30aa14f267b661680d82875f2e2595.png)
.
![](https://img.xkw.com/dksih/QBM/2020/1/30/2388309175549952/2389603076481024/STEM/800cf68de7aa4ebd898b31bcd8fc2c38.png?resizew=178)
(1)求证:
;
(2)求证:
;
(3)若点
到三角形的边
,
,
的距离分别为
,
,
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff3f34b0932d146055ae7eb832295902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934f9b1b3bf5b1a3ef81c03aaca1700e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2333da32638ec636fa1e69e750ca4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc30aa14f267b661680d82875f2e2595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6750fa92a89d9b732b61e4c6d7052a2a.png)
![](https://img.xkw.com/dksih/QBM/2020/1/30/2388309175549952/2389603076481024/STEM/800cf68de7aa4ebd898b31bcd8fc2c38.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93847ba75e656c4a95b760dc9a08995d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eebf9c5fa220910160a9c770ee80a68.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.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/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b53eab97158937f92039c1e133b0f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f285174fbf90a9742de57c1e53224cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e8854159e7443b5fe53436bf9e367f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4536817edb4999ea4131f3d5b30d2547.png)
更新时间:2020-02-01 13:22:48
|
【知识点】 相似三角形的判定与性质综合
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解答题-证明题
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【推荐1】如图,在
中,
是一条不过圆心O的弦,点C,D是
的三等分点,直径
交
于点F,连结
交
于点G,连结
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;
(2)若
,求
的值;
(3)连结
交
于点N,若
的半径为5.
下面三个问题,依次按照易、中、难排列.请根据自己的认知水平,选择其中一道问题进行解答.
①若
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②若
,求
的周长;
③若
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的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bda6099815c28ad4901e0e043c07ef6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8a5858d4cb71dcd0ec498120a209382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dddacbc1f1cbc197795542dedd8f8a2.png)
(3)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
下面三个问题,依次按照易、中、难排列.请根据自己的认知水平,选择其中一道问题进行解答.
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e371961a7feb7212e56121696f1680.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a97f5a661b48581b021bbfc3e5118b.png)
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③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/666d7eadfd068b947b82de44242dfbeb.png)
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您最近一年使用:0次
解答题-问答题
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较难
(0.4)
【推荐2】在
中,
,
,点P是平面内不与点B,C重合的一动点,连接PC,将线段PC绕点P顺时针旋转
得到线段PQ,连接BQ,CQ,AP,点M,N分别是线段CB,CQ的中点,连接MN.
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949674295009280/2957281538850816/STEM/647a0f460ef54bd49d695498ab5f952b.png?resizew=521)
(1)【观察猜想】如图1,当点P与点B在直线CA两侧,
时,
的值是______,直线MN与直线PA所成的锐角的度数是______;
(2)【类比探究】如图2,当点P与点B在直线CA两侧,
时,求
的值及直线MN与直线PA所成的锐角的度数;
(3)【解决问题】当点P在直线BC上方,
,且点A,P,Q在同一条直线上时,连接BP,已知
,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949674295009280/2957281538850816/STEM/647a0f460ef54bd49d695498ab5f952b.png?resizew=521)
(1)【观察猜想】如图1,当点P与点B在直线CA两侧,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874d029eed2f2b791626e4c03277181d.png)
(2)【类比探究】如图2,当点P与点B在直线CA两侧,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03f73bec20b60bc7608972607f5a9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874d029eed2f2b791626e4c03277181d.png)
(3)【解决问题】当点P在直线BC上方,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3462640c7bea3bc941009b164e118c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874d029eed2f2b791626e4c03277181d.png)
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解答题-证明题
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较难
(0.4)
【推荐3】如图1,四边形OMTN中,OM =ON,TM =TN,我们把这种两组邻边相等的四边形叫做筝形.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897725544472576/2915514945413120/STEM/c10b3ba0-78a8-4e6e-8623-293f8ad8d4a0.png?resizew=542)
(1)探究结论:试探究筝形对角线之间的位置关系,并证明你的结论;
(2)尝试应用:如图2,在筝形ABCD中,已知DC=AD=10,AB=CB,BC>CD,BD,AC为对角线,AC=16.若存在一个圆使得A,B,C,D四个点都在这个圆上,试求出这个圆的半径;
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(1)探究结论:试探究筝形对角线之间的位置关系,并证明你的结论;
(2)尝试应用:如图2,在筝形ABCD中,已知DC=AD=10,AB=CB,BC>CD,BD,AC为对角线,AC=16.若存在一个圆使得A,B,C,D四个点都在这个圆上,试求出这个圆的半径;
(3)拓展延伸:如图,将正方形ABCD绕点B逆时针旋转30°,得到正方形GBEF,AD与EF相交于点K,延长DA交GF于点H.①证明四边形KABE是筝形 ;②若AB=
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您最近一年使用:0次