如图,
ABC内接于⊙O,且AB=AC,其外角平分线AD与CO的延长线交于点D.
(1)求证:直线AD是⊙O的切线;
(2)若AD=2
,BC=6,求图中阴影部分面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)求证:直线AD是⊙O的切线;
(2)若AD=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/3/dd9596c3-8b97-4d24-aeff-3dc2c5e31c62.png?resizew=144)
2021·四川巴中·中考真题 查看更多[3]
四川省巴中市2021年中考数学真题试卷(已下线)热点10 圆-2022年中考数学【热点·重点·难点】专练(已下线)专题24 圆的证明与计算题型解答题专项训练-备战2022年中考数学临考题号押题(全国通用)
更新时间:2021-08-25 20:39:16
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解答题-问答题
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【推荐1】如图:抛物线
与x 轴交于A、B两点,点A的坐标是(1,0),与y轴交于点C.
(1)求抛物线的对称轴和点B的坐标;
(2)过点C作CP⊥对称轴于点P,连接BC交对称轴于点D,连接AC、BP,且∠BPD=∠BCP,求抛物线的解析式;
(3)在(2)的条件下,设抛物线的顶点为G,连接BG、CG、求⊿BCG的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2851626d1439405eb81dc0e31042cd33.png)
(1)求抛物线的对称轴和点B的坐标;
(2)过点C作CP⊥对称轴于点P,连接BC交对称轴于点D,连接AC、BP,且∠BPD=∠BCP,求抛物线的解析式;
(3)在(2)的条件下,设抛物线的顶点为G,连接BG、CG、求⊿BCG的面积.
![](https://img.xkw.com/dksih/QBM/2011/8/29/1573248234127360/1573248310034432/STEM/db114580-3dc4-462c-a531-46e35cb05198.png?resizew=185)
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解答题-作图题
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【推荐2】如图,在
中,
,
.
(1)利用尺规在线段
上找点
,使得
,作
,使
经过点
,该圆与
的另一交点为
(保留作图痕迹,不写作法);
(2)过点
作
交
于
,连接
,求
和
的面积比.
![](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/2fb01d2b57580731c8b807ac8cffc8ba.png)
(1)利用尺规在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dd70d232e6b0cab88de80ef86463bca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/38e18d95-a3bc-4f57-91db-6a89c896b66d.png?resizew=170)
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解答题-证明题
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【推荐1】在Rt△ABC中,∠ACB
90°,AC=6,∠B=30°,点M是AB上的动点,以M为圆心,MB为半径作圆交BC于点D,
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893582436745216/2949609223421952/STEM/167d5726-4714-4bd9-a4c9-91d6e865894e.png?resizew=497)
(1)若圆M与AC相切,如图1,求圆的半径;
(2)若AM=2MB,连接AD,如图2.
①求证:AD与圆M相切;
②求阴影部分的面积;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7081ac76e5ac1e22e848eec143578f1c.png)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893582436745216/2949609223421952/STEM/167d5726-4714-4bd9-a4c9-91d6e865894e.png?resizew=497)
(1)若圆M与AC相切,如图1,求圆的半径;
(2)若AM=2MB,连接AD,如图2.
①求证:AD与圆M相切;
②求阴影部分的面积;
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【推荐2】数学课上,赵老师在黑板上写出以下已知条件:如图,在
中
,点
是
的中点,以
为直径作
交
于点
,连接
,
,
.王洋同学根据赵老师给出的已知条件提出以下两个问题,请你帮助王洋完成:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/209b549c-3d06-4179-83ce-be6e1c2e512b.png?resizew=122)
(1)求证:
;
(2)若
的半径为3,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/3d97cdc586744d208b6f69c9813af977.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/209b549c-3d06-4179-83ce-be6e1c2e512b.png?resizew=122)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1ea867a9e957bab69d05e200b878fe.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1e7f5a2a4b85244fe9dc569009cf9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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