探究题:如图1,
和
均为等边三角形,点
在边
上,连接
.
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481434061520896/2483948757721088/STEM/ce35189e9f0c4ed08079c1c085f109f5.png?resizew=148)
(1)请你解答以下问题:
①求
的度数;
②写出线段
,
,
之间数量关系,并说明理由.
(2)拓展探究:如图2,
和
均为等腰直角三角形,
,点
在边
上,连接
.请判断
的度数及线段
,
,
之间的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481434061520896/2483948757721088/STEM/ed36df4e2e664435b59594dbe59be47e.png?resizew=175)
(3)解决问题:如图3,在四边形
中,
,
,
,
与
交于点
.若
恰好平分
,请直接写出线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481434061520896/2483948757721088/STEM/ce35189e9f0c4ed08079c1c085f109f5.png?resizew=148)
(1)请你解答以下问题:
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
②写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)拓展探究:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481434061520896/2483948757721088/STEM/ed36df4e2e664435b59594dbe59be47e.png?resizew=175)
(3)解决问题:如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db558e8db4c957654c8e5cecd2d2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481434061520896/2483948757721088/STEM/fe2dc10f7c5c420fa19a267eaf80c0df.png?resizew=131)
更新时间:2020-06-13 20:29:35
|
相似题推荐
解答题-证明题
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【推荐1】思维启迪:(1)如图1,A,B两点分别位于一个池塘的两端,小亮想用绳子测量A,B间的距离,但绳子不够长,聪明的小亮想出一个办法:先在地上取一个可以直接到达B点的点C,连接BC,取BC的中点P(点P可以直接到达A点),利用工具过点C作CD∥AB交AP的延长线于点D,此时测得CD=200米,那么A,B间的距离是 米.
![](https://img.xkw.com/dksih/QBM/2019/7/14/2246235311349760/2252375443103744/STEM/2519a99dfe8945b1912105b5069df1fe.png?resizew=553)
思维探索:(2)在△ABC和△ADE中,AC=BC,AE=DE,且AE<AC,∠ACB=∠AED=90°,将△ADE绕点A顺时针方向旋转,把点E在AC边上时△ADE的位置作为起始位置(此时点B和点D位于AC的两侧),设旋转角为α,连接BD,点P是线段BD的中点,连接PC,PE.
①如图2,当△ADE在起始位置时,猜想:PC与PE的数量关系和位置关系分别是 ;
②如图3,当α=90°时,点D落在AB边上,请判断PC与PE的数量关系和位置关系,并证明你的结论;
③当α=150°时,若BC=3,DE=l,请直接写出PC2的值.
![](https://img.xkw.com/dksih/QBM/2019/7/14/2246235311349760/2252375443103744/STEM/2519a99dfe8945b1912105b5069df1fe.png?resizew=553)
思维探索:(2)在△ABC和△ADE中,AC=BC,AE=DE,且AE<AC,∠ACB=∠AED=90°,将△ADE绕点A顺时针方向旋转,把点E在AC边上时△ADE的位置作为起始位置(此时点B和点D位于AC的两侧),设旋转角为α,连接BD,点P是线段BD的中点,连接PC,PE.
①如图2,当△ADE在起始位置时,猜想:PC与PE的数量关系和位置关系分别是 ;
②如图3,当α=90°时,点D落在AB边上,请判断PC与PE的数量关系和位置关系,并证明你的结论;
③当α=150°时,若BC=3,DE=l,请直接写出PC2的值.
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【推荐2】如图,AB、AC分别是⊙O的直径和弦,点D为劣弧AC上一点,弦DE⊥AB分别交⊙O于E,交AB于H,交AC于F.P是ED延长线上一点且PC=PF.
(1) 求证:PC是⊙O的切线;
(2) 点D在劣弧AC什么位置时,才能使
,为什么?
(3) 在(2)的条件下,若OH=1,AH=2,求弦AC的长.
(1) 求证:PC是⊙O的切线;
(2) 点D在劣弧AC什么位置时,才能使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ae487bbaebcc96f951068580933c3f.png)
(3) 在(2)的条件下,若OH=1,AH=2,求弦AC的长.
![](https://img.xkw.com/dksih/QBM/2020/2/16/2406888940740608/2433732488290304/STEM/6fa379aad3ff42d0ae5e139482348c59.png?resizew=137)
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解答题-问答题
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【推荐1】在数学综合实践课上,仿照北师大版九年级上册第8页,老师让同学们以“矩形的旋转”为主题开展探究活动.如图1,将长与宽都相等的两个矩形纸片
和
叠放在一起,固定矩形
,将矩形
绕
的中点O逆时针旋转![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efc7b22d85ff04a0ac89743f0bea1f2.png)
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/9f9ae777-e5f3-4f7a-adac-fe6a3f1bcded.png?resizew=428)
(1)初步发现:在旋转过程中,对角线
与边
、
分别交于点S、T,如图2,则线段
与
始终存在着怎样的数量关系?请说明理由;
(2)继续探究:旋转过程中,当两个矩形纸片重叠部分为四边形
时,如图2.
①求证:四边形
为菱形;
②随着矩形纸片
的旋转,四边形
的面积会发生变化,若
,
,请求出四边形
的最大面积与最小面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efc7b22d85ff04a0ac89743f0bea1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff220cc9fcaceca96d82f0d5730252c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/9f9ae777-e5f3-4f7a-adac-fe6a3f1bcded.png?resizew=428)
(1)初步发现:在旋转过程中,对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.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/9d66b83d9dbcb45e1c241d18a3e1843f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99fa94a1f3e4964fcc13a14fab9ba5.png)
(2)继续探究:旋转过程中,当两个矩形纸片重叠部分为四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41beb4dc4c0750f1fc4281caf908d719.png)
①求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41beb4dc4c0750f1fc4281caf908d719.png)
②随着矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41beb4dc4c0750f1fc4281caf908d719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41beb4dc4c0750f1fc4281caf908d719.png)
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解答题-作图题
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【推荐2】我们定义:如图1,在△ABC中,把AB绕点A按顺时针方向旋转α(0°<α<180°)得到AB′,把AC绕点A按逆时针方向旋转β得到AC′,连接B′C′,当α+β=180°时,我们称△AB′C′是△ABC的“旋补三角形”,△AB′C′边B′C′上的中线AD叫做△ABC的“旋补中线”,点A叫做“旋补中心”.
![](https://img.xkw.com/dksih/QBM/2019/5/16/2205006521049088/2208389994094592/STEM/5aba67649e514d69a904ac70cb33dc6f.png?resizew=540)
(1)特例感知:在图2、图3中,△AB′C′是△ABC的“旋补三角形”,AD是△ABC的“旋补中线”.
①如图2,当△ABC为等边三角形时,AD与BC的数量关系为AD=______BC;
②如图3,当∠BAC=90°,BC=8时,则AD长为______.
(2)精确作图:如图4,已知在四边形ABCD内部存在点P,使得△PDC是△PAB的“旋补三角形”(点D的对应点为点A,点C的对应点为点B),请用直尺和圆规作出点P(要求:保留作图痕迹,不写作法和证明)
(3)猜想论证:在图1中,当△ABC为任意三角形时,猜想AD与BC的数量关系,并给予证明.
![](https://img.xkw.com/dksih/QBM/2019/5/16/2205006521049088/2208389994094592/STEM/5aba67649e514d69a904ac70cb33dc6f.png?resizew=540)
(1)特例感知:在图2、图3中,△AB′C′是△ABC的“旋补三角形”,AD是△ABC的“旋补中线”.
①如图2,当△ABC为等边三角形时,AD与BC的数量关系为AD=______BC;
②如图3,当∠BAC=90°,BC=8时,则AD长为______.
(2)精确作图:如图4,已知在四边形ABCD内部存在点P,使得△PDC是△PAB的“旋补三角形”(点D的对应点为点A,点C的对应点为点B),请用直尺和圆规作出点P(要求:保留作图痕迹,不写作法和证明)
(3)猜想论证:在图1中,当△ABC为任意三角形时,猜想AD与BC的数量关系,并给予证明.
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【推荐1】如图,在
中,
,
,垂足为
,点
是边
上的一个动点,过点
作
交线段
于点
,作
交
于点
,交线段
于点
,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/b2349a69-e04b-4c77-a022-afd556c06592.png?resizew=140)
(1)用含
的代数式表示线段
的长;
(2)设
的面积为
,求
与
之间的函数关系式,并写出定义域;
(3)若
为直角三角形,求出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ddc3178cc8ac2e034fe3b1723b4bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e415ddbfce6e8f1b1fafc23b6c24ba4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73d7566369c178316219bb466a66d062.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a666403569e607f32af5f762c246dc7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/b2349a69-e04b-4c77-a022-afd556c06592.png?resizew=140)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b51d3992644d37dc71c9b5a97d515c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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【推荐2】(1)如图1,
为等边三角形,点
、
分别为边
、
上的一点,将图形沿线段
所在的直线翻折,使点
落在
边上的点
处.求证:
.
(2)如图2,按图1的翻折方式,
,当
时,求
的值;
(3)如图3,在
中,
,
,
,点
是
边上的中点,射线
与射线
关于直线
对称,点
是射线
上一个动点,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e579da67b8ed692289c52c6858252f22.png)
(2)如图2,按图1的翻折方式,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3c17ad6f7cfac393db6251a1572613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22fe63aa2211fe99884b9214b3cdb4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1535c0b92b25826ee65b6edd311ebf46.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e240a6378adf6d23ebf9cc710c9bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63247af194edc9d72cd3ca7365a5d128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】定义:有一组邻边相等 且对角互补 的四边形叫做等补四边形,
【理解】
(1)如图1,点A、
、
在
上,
的平分线交
于点
,连接
、
.则四边形
是等补四边形.
请直接写出图中相等的边:______;互补的角:______.
【探究】
(2)如图2,在等补四边形
中,
,连接
,
是否平分
?请说明理由.
【运用】
(3)如图3,在等补四边形
中,
,其外角
的平分线交
的延长线于点
,
,
,直接写出
的长.
【理解】
(1)如图1,点A、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
请直接写出图中相等的边:______;互补的角:______.
【探究】
(2)如图2,在等补四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.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/727ad3e630a224303d6d3b8ad5c114ba.png)
【运用】
(3)如图3,在等补四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e37b078d02601f76f0f8320b410809f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640f058b479299659893cf524ddf6544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21d8e7af78693e5da7957c8034e8bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,圆
的弦
,点
为圆外一点,连结
分别交圆
于点
,点
,
,连结![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)如图1,若圆的半径5,
,求
的长;
(2)如图2,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4836945f324c29ef818b423bcc017a93.png)
①求
的值;
②求圆
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cf89cd1b2aa78def32c227659015e27.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/af5b3967aa677f18e92912d2397f4907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/3d17d9c5-2614-43b6-b8e2-525166fb933f.png?resizew=370)
(1)如图1,若圆的半径5,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4836945f324c29ef818b423bcc017a93.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b33fd78b38f63089ddd5922512a1d33.png)
②求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
您最近一年使用:0次