如图,
为
的直径,
为
上两点,且
为弧
的中点,过点
作
的垂线,交
的延长线于点
,交
的延长线于点
,连结![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)求证:
是
的切线;
(2)当
时,求
的长.
![](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/39acab3cfb59bfc9591371721ab01d93.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3100180e0c5e5629049c55118f61b6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2020/11/23/2599127601209344/2604702696275968/STEM/b4b5d93d7fea43ca8afe162bb8626fde.png?resizew=186)
更新时间:2020-12-01 11:04:06
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是
的直径,
是
的切线,
为切点,连接
,过点
作
交
于点
,连接
和
,
交
于点
.
是
的切线;
(2)若
,且
,求切线
的长.
![](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/bd33764ff4efddfe11a98a609753715c.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/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce810125636930353371c85e3fd2e8d.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30a469f69852672377e0f323af8995c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在△ABC中,∠A=45°,以AB为直径的⊙O交于AC的中点D,连接CO,CO的延长线交⊙O于点E,过点E作EF⊥AB,垂足为点G.
(1)求证:BC时⊙O的切线;
(2)若AB=2,求线段EF的长.
(1)求证:BC时⊙O的切线;
(2)若AB=2,求线段EF的长.
![](https://img.xkw.com/dksih/QBM/2017/1/4/1633719251255296/1633719251656704/STEM/15c4cc87c5fa4594914627513b0f2626.png)
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解答题-计算题
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适中
(0.65)
【推荐1】图1是小明在健身器材上进行仰卧起坐锻炼时的情景,图2是小明锻炼时上半身由
位置运动到与地面垂直的
位置时的示意图.已知
米,
米,
.(参考数据:
,
,
)
(1)求
的长.
(2)若测得
米,试计算小明头顶由N点运动到M点的路径
的长度.(结果保留
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a913218fcc7726851e26654f7e44c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/493283e1cd8a857dcf56eff6ef88f893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1c1f4cfcce790342cdbf02b2d23e9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b25098b4afddf05c8c6d293f2eb20e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b2f83631f80bb64cf8918294839ac3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/24/66175d17-63d6-42da-8838-8cd4041d6248.png?resizew=295)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若测得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30ad186d531a980cb3737722deddb0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ae728c7be0f0cf78711f3fa5ccccf30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐2】如图,在
中,
,
,将
绕点
逆时针旋转60°,得到
,连结
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/834b1e9c904906c46d4f69e3b7765b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881609207185408/2928856532811776/STEM/0accebfd7e5c4d5daf60d22ee679f5fa.png?resizew=140)
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解答题-问答题
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适中
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真题
【推荐3】第24届冬奥会(也称2022年北京冬奥会)于2022年2月4日至2月20日在中国北京举行,北京成为了历史上第一座既举办过夏奥会又举办过冬奥会的城市.冬奥会上跳台滑雪是一项极为壮观的运动.运动员经过助滑、起跳、空中飞行和着陆,整个动作连贯一致,一气呵成,如图,某运动员穿着滑雪板,经过助滑后,从倾斜角
的跳台A点以速度
沿水平方向跳出,若忽略空气阻力影响,水平方向速度将保持不变.同时,由于受重力作用,运动员沿竖直方向会加速下落,因此,运动员在空中飞行的路线是抛物线的一部分,已知该运动员在B点着陆,
,且
.忽略空气阻力,请回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/130b9550-6276-4ff8-b2b4-b56d2033cf37.png?resizew=196)
(1)求该运动员从跳出到着陆垂直下降了多少m?
(2)以A为坐标原点建立直角坐标系,求该抛物线表达式;
(3)若该运动员在空中共飞行了4s,求他飞行2s后,垂直下降了多少m?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fda5655ef480683a2d3b74f0b523439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f58888df91890a19a1aa7511d19703f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5393e5d692d2f8fb2d2c0dbfe7d6f5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986badfc5dea707c164e2ab6c98dd06.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/130b9550-6276-4ff8-b2b4-b56d2033cf37.png?resizew=196)
(1)求该运动员从跳出到着陆垂直下降了多少m?
(2)以A为坐标原点建立直角坐标系,求该抛物线表达式;
(3)若该运动员在空中共飞行了4s,求他飞行2s后,垂直下降了多少m?
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