如图,在等边
中,
,
,如果点M以6cm/s的速度运动.
(1)如果点M在线段
上由点C向点B运动,点N在线段
上由B点向A点运动.它们同时出发,若点N的运动速度与点M的运动速度相等.经过2s后,
和
是否个等?请说明理由;
(2)在(1)的条件下,当两点的运动时间为多少时,
是一个直角三角形?
(3)若点N的运动速度与点M的运动速度不相等,点N从点B出发,点M以原来的运动速度从点C同时出发,都顺时针沿
三边运动,经过25s点M与点N第一次相遇,则点N的运动速度是多少cm/s.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09500471f9a8c85fd46077f9a8cbbba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6bb8180b5ec79816ba3a85be3da5bf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/29/ef9785d5-70c5-4d0a-9af4-205217ca39f0.png?resizew=159)
(1)如果点M在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e59b7c0d4a0b312e674b7bb061240b.png)
(2)在(1)的条件下,当两点的运动时间为多少时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
(3)若点N的运动速度与点M的运动速度不相等,点N从点B出发,点M以原来的运动速度从点C同时出发,都顺时针沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
更新时间:2023-07-24 20:46:39
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】【综合探究】:如图1,一副三角板如图所示放置在直线
上,
,
,
,
.三角板
的顶点与另一个三角板
的顶点重合在点O处,三角板的边
与直线
重合,三角板其它的边都在直线
的上方.
【实践探究】:
(1)如图2,若三角板
不动,将三角板
绕点O以每秒
的速度按顺时针方向旋转一周,经过t秒时,三角板
的边
恰好分
.
①此时
_____秒;
②此时
_____
______
;
【解决问题】:
(2)如图2,在(1)的条件下,边
恰好平分
时,同一时刻三角板
开始也绕点O以每秒
的速度按相同方向旋转,那么再经过多长时间边
与边
第一次重合?(如图3)请说明理由;
【拓展研究】:
(3)如图3,在(2)的条件下,当边
与边
第一次重合时,两个三角板同时按顺时针方向再次转动一周后停止,请问两个三角板再次转动后,经过多少秒,边
恰好平分
?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50fdfa5407cfa15978f3557cacdf27c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8cc88685997c7586d1d4bf75a055433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7e070904b3ed052efd692524d128b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f9fda6f191a57ae8b1061db2031ad6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
【实践探究】:
(1)如图2,若三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf126cfed85fa9b7720ec6f7b0008dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc63679c80e6bd24f3a27763d545dcdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf126cfed85fa9b7720ec6f7b0008dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
①此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
②此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b05714b8620eba2f56084a91442533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fea6af9796820e44593f78519a969e6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/003ad63ef9fae0709f5bbd4b292c72c6.png)
【解决问题】:
(2)如图2,在(1)的条件下,边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb0aa8a61380228e285f3b5c7b74c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
【拓展研究】:
(3)如图3,在(2)的条件下,当边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/af887f53-5f23-4239-ad87-af2daedb055b.png?resizew=478)
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名校
【推荐2】已知,如图1,直线
,E为直线
上方一点,连接
,
与
交于P点.
,则
_________![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图1所示,作
的平分线交
于点F,点M为
上一点,
的平分线交
于点H,过点H作
交
的延长线于点G,
,且
,求
的度数.
(3)如图2,在(2)的条件下,
,将
绕点F顺时针旋转,速度为每秒钟
,记旋转中的
为
,同时
绕着点D顺时针旋转,速度为每秒钟
,记旋转中的
为
,当
旋转一周时,整个运动停止.设运动时间为t(秒),则当
其中一条边与
的边DF′互相垂直时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa2df7d46ea053fa0effdea9c55a60de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83861e20968ab4c356b57eb5d535491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b83764876be47a196fd5f408763738a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图1所示,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.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/eb8a9d060951846df41c672fabc9956e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a150bda1e17d511630b73d4c8db441.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87ee55202406764c7e744b383e9ac6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4c43f6dbea09c66c7fc27f7152b5db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a995119a6782e5a03c8140a3829e7c1.png)
(3)如图2,在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af33abb71a8a4d8b77559cdce6ed0612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6ddd0810c99a69fc542f7d4d204536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654c79a470d5af5e0a34fd9233da5118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6ddd0810c99a69fc542f7d4d204536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0196bc25c768e142c9e86e24f8d84c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d263124915e6bac6d78df07706d8f804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/741a44528782580d24249e8075b8cd9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d263124915e6bac6d78df07706d8f804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d03d25cf7bb2387c43bf10bc947f8a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d263124915e6bac6d78df07706d8f804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0196bc25c768e142c9e86e24f8d84c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d03d25cf7bb2387c43bf10bc947f8a2.png)
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解答题-证明题
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较难
(0.4)
【推荐1】已知正方形
,
为对角线
上一点.
【建立模型】
(1)如图1,连接
,
.求证:
;
【模型应用】
(2)如图2,
是
延长线上一点,
,
交
于点
.求证:
是等腰三角形;
【模型迁移】
(3)如图3,
是
延长线上一点,
,
交
于点
,
,
.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
【建立模型】
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
【模型应用】
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0136a534af8311391c2a8e532614aa02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4da8c9541c01c2fa51788ed30cd6a9.png)
【模型迁移】
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0136a534af8311391c2a8e532614aa02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d96a5d40d0aea9f4398ca4d0fe9b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb55961fe96e155242d18d98e5c2261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
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【推荐2】如图,点O为线段AD上一点,
于点O,
,
,点M、N分别是AC、BD的中点,连接OM、ON、MN.
求证:
;
试判断
的形状,并说明理由;
若
,在图2中,点M在DB的延长线上,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0ec4d36114b724d441bebeae918999.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b20d00534d4c50469b4b95715292a624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab7098d568af0c77068850b226bacdb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53d7a9045b1478397816ca248377a3af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc78de2fcb6bb6945733fe2af85b8efb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb3bc391bcdfdc7119d40450f234c90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17b7e20a8c2177fe4c7804da52613b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5e299180c79567f4dc7711828eca325.png)
![](https://img.xkw.com/dksih/QBM/2019/4/11/2180028163686400/2181432184496128/STEM/559d8ae93e9644a78460a70afec4a799.png?resizew=431)
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名校
【推荐1】已知等边三角形
,过A点作
的垂线l,点P为l上一动点(不与点A重合),连接
,把线段
绕点C逆时针方向旋转
得到
,连
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/9907b55e-0f13-49b4-9192-4b3986d7edc5.png?resizew=523)
(1)如图1,
______
(填“>”,“=”或“<”);
(2)如图2,当点P、B在
同侧且
时,连接
并延长交
于点D,求线段
与
的数量关系;
(3)如图3,若等边三角形
的边长为
,点P、B分别位于直线
异侧,点A,P,Q不在同一直上且
的面积等于
,求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf702adb116c1e46569eb7050d029f49.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/9907b55e-0f13-49b4-9192-4b3986d7edc5.png?resizew=523)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
(2)如图2,当点P、B在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42de572d68ded125eccccc512c4fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
(3)如图3,若等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e162b98c280720fcb909cf392fda3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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【推荐2】据《尔雅·释器》记载:“好倍肉,谓之瑗(yuàn).”如图1,“好”指中间的孔,“肉”指中孔以外的边(阴影部分),“好倍肉”指中孔和环边比例为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/51c1a1c6-8e48-4cfe-b478-3f82acc77d93.png?resizew=411)
(1)观察:
“瑗”的主视图可以作两个同心圆,根据图1中的数据,可得小圆与大圆的半径之比是_______;
(2)联想:
如图2,在
中,
,
,
平分
交
于点
,则
_______;
(3)迁移:
图3表示一个圆形的玉坯,若将其加工成玉瑗,请利用圆规和无刻度的直尺先确定圆心 ,再以题(2)的知识为作图原理作出内孔 .(不写作法,保留作图痕迹)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe103f073845122c66f22dcb14b711f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/51c1a1c6-8e48-4cfe-b478-3f82acc77d93.png?resizew=411)
(1)观察:
“瑗”的主视图可以作两个同心圆,根据图1中的数据,可得小圆与大圆的半径之比是_______;
(2)联想:
如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.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/347cca547fc7d2c7f85752b08f14cfca.png)
(3)迁移:
图3表示一个圆形的玉坯,若将其加工成玉瑗,请利用圆规和无刻度的直尺
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较难
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【推荐1】(1)问题发现:如图1,
和
都是等边三角形,连接
、
,延长
交
于点
,求证:
,
;
(2)类比探究:如图2,
和
都是等腰直角三角形,即
,
,
,则
与
存在怎样的数量关系及位置关系,并说明理由;
(3)问题解决:若
和
都是等腰三角形,且
,
,
,请直接写出线段
和
的数量关系及它们所在直线的夹角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ecfdd83321a6e877011cad55b1ec56.png)
(2)类比探究:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)问题解决:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b63c97140963ac5b6bf8f584148cf0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/040f525a-57e4-44dc-8a5b-7dece94605d4.png?resizew=408)
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解答题-证明题
|
较难
(0.4)
【推荐2】如图,点O是等边△ABC内一点,∠AOB=110°,∠BOC=a,以OC为一边作等边△OCD,连接AD.
(1)求证:△BOC≌△ADC;
(2)当OA=OD时,求a的值
(1)求证:△BOC≌△ADC;
(2)当OA=OD时,求a的值
![](https://img.xkw.com/dksih/QBM/2018/1/29/1871092403404800/1872869142700032/STEM/efa7710705604392b78da21bbe0fafbe.png?resizew=205)
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解答题-证明题
|
较难
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解题方法
【推荐3】如图,过边长为4的等边△ABC的顶点A作直线l∥BC,点D在直线l上(不与点A重合),作射线BD,将射线BD绕点B顺时针旋转60°后交直线AC于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/01a3c36a-4a3a-414f-bfe1-a8a88c7ffe24.png?resizew=436)
(1)如图1,点D在点A的左侧,点E在边AC上,请直接写出AB,AD,AE间的关系
(2)如图2,点D在点A的右侧,点E在边AC的延长线上,那么(1)中的结论还成立吗?若成立,请证明;若不成立,写出你的结论,再证明.
(3)如图3,点E在边AC的反向延长线上,若∠ABE=15°,请直接写出线段AD的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/01a3c36a-4a3a-414f-bfe1-a8a88c7ffe24.png?resizew=436)
(1)如图1,点D在点A的左侧,点E在边AC上,请直接写出AB,AD,AE间的关系
(2)如图2,点D在点A的右侧,点E在边AC的延长线上,那么(1)中的结论还成立吗?若成立,请证明;若不成立,写出你的结论,再证明.
(3)如图3,点E在边AC的反向延长线上,若∠ABE=15°,请直接写出线段AD的长.
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