如图,射线
的端点O在直线
上,
于点O,且
平分
,
平分
,若
,分别求
与
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f3523108b503fedfae58dc10673697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76cc7fec25d61981c418248e5e933cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21a52e349973e2c589b48066c9068a8e.png)
![](https://img.xkw.com/dksih/QBM/2020/2/29/2409410899574784/2410144872398848/STEM/f691eaeec6c842ed88e411a6ba6c8d50.png?resizew=189)
更新时间:2020-03-01 13:55:12
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐2】如图1所示是某款手表实物图,其示意图如图2所示,已知表盘是以O为圆心,以
厘米为半径的圆,
为圆的直径,其中时针为线段
,分针为线段
,且点A、B、O、C、D都在同一条直线上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/150a38a1-e0bd-4ff0-9e97-d9008b562a6c.png?resizew=400)
(1)若点B,C是线段
的三等分点,求表长
.
(2)若手表显示是9点30分.
①求此时时针与分针的夹角
的大小;
②此时,作射线
,使
,求
的大小;
(3)自9点30分起,至10点30分止,在这一小时期间,时针
和分针
在不停地旋转.若射线
是
的平分线,它也随之运动,则经过多少分钟后,恰好能使
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7c304b64435d1697c1ea29efe08fb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/150a38a1-e0bd-4ff0-9e97-d9008b562a6c.png?resizew=400)
(1)若点B,C是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)若手表显示是9点30分.
①求此时时针与分针的夹角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
②此时,作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae4a159f6706bc8d4425d006523dd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/861d02330f6bad86f5bcdfd8141ca626.png)
(3)自9点30分起,至10点30分止,在这一小时期间,时针
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6199ade7b53bdcd41bb2cf2ec14eb28.png)
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【推荐1】如图,以直线
上一点O为端点作射线
,使
,将一个直角三角形的直角顶点放在点O处.(注:
)
(1)如图①,若直角三角板
的一边
放在射线
上,求
的度数.
(2)如图②,将直角三角板
绕点O顺时针方向转动到某个位置,若
恰好平分
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85171ba0cd82410061db185a1ff7a9d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95a92fcd0cd5e55f1d32d42504a5690.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/1bb63a32-2cae-4bfb-a816-ca2f44b0fbdf.png?resizew=249)
(1)如图①,若直角三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f55c6ac896ab4277fae2230a6e10b0.png)
(2)如图②,将直角三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
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解答题-作图题
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【推荐2】直线
,点E,F分别在直线
,
上,
平分
,
平分
.
(1)如图1,求
的度数;
(2)如图2.
,
,
,求n的值;
(3)如图3,延长
交
于点K,点M在射线
上(点M不与点K,F重合),
平分
,画出图形,写出
与
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.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/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6a23d521606a35298bbf147f7f830c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7724af2445c723d1392aed54d210ed3a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/13/a7b82c10-ca75-4029-bafa-a52d5415c900.png?resizew=603)
(1)如图1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d6902c8862bd2616be038549f77aff.png)
(2)如图2.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f9187f24908e7f4e17fbdb874d9f26d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a77544970fe1e1cf7332791778be47d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a7ec6066127a357b2f9c1e4114e2ec4.png)
(3)如图3,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ac28c7adade476df476c2bf90a8416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4410f982bf334fa726c417ee1d6554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f986feed91eebfc0b16503eaa2045d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b89403a4db68423b83136d2cbff6225.png)
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解答题-作图题
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【推荐3】阅读材料并回答问题.
数学课上,老师提出了如下问题:已知点
在直线
上,
,在同一平面内,过点
作射线
,满足
.当
时,如图1所示,求
的度数.
甲同学:以下是我的解答过程(部分空缺)
解:如图2,∵点O在直线
上,
∴
,
∵
,
∴
,
,
∴
平分
,
∴
,
∵
,
,
∴
.
乙同学:“我认为还有一种情况.”
请完成以下问题:
(1)请将甲同学解答过程中空缺的部分补充完整.
(2)判断乙同学的说法是否正确,若正确,请在图1中画出另一种情况对应的图形,并求
的度数,写出解答过程;若不正确,请说明理由.
(3)将题目中“
”的条件改成“
”,其余条件不变,当
在
到
之间变化时,如图3所示,
为何值时,
成立?请直接写出此时
的值.
数学课上,老师提出了如下问题:已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1009c80f5e73d0b43836e18c21fc3041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070dca60e5734051ab087b131936c8de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1dd3c503ff0b4e68f035709e34bc63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/2/42192e75-d08a-4530-92e2-f97dbec03ae1.png?resizew=485)
甲同学:以下是我的解答过程(部分空缺)
解:如图2,∵点O在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2979f64c85f82d8975d73ee1c342de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1dd3c503ff0b4e68f035709e34bc63.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021bc0ff7e36c9d6d70ddd2e51e8c04c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df367e658deefd2d19407c0f146e3716.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e613a5e3aec7fa3e340b2158326272e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a113fb8d384f0f821f289783d4c2358e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1009c80f5e73d0b43836e18c21fc3041.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b600f913d6d700bbd332b34220b78a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
乙同学:“我认为还有一种情况.”
请完成以下问题:
(1)请将甲同学解答过程中空缺的部分补充完整.
(2)判断乙同学的说法是否正确,若正确,请在图1中画出另一种情况对应的图形,并求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
(3)将题目中“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1dd3c503ff0b4e68f035709e34bc63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcbec8352ce3dbfbf3b173045d0ba8f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1720ed2ee45e4ccf61d332e0339378ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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