如图,直线
与
相交于点O,
平分
,已知
.
的度数;
(2)过点O作射线
,画出图形,并求
的度数.
![](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/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfcc6ea3a5df3a1c0104f36b3c51455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
(2)过点O作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dfd76d4b9cd52e6f101538689fe1778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/155bdf43719f34f20418ea2c21763588.png)
更新时间:2024-05-12 19:18:32
|
相似题推荐
解答题-问答题
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适中
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名校
【推荐1】【材料阅读】
如图,数轴上的点
、
表示的数分别为
、
,
是线段
的中点.
表示的数是___________;
(2)若点
、
分别从点
、
同时出发,以每秒
个单位长度和
个单位长度的速度沿数轴正方向运动,设运动时间为t秒,若
、Q两点之间的距离为2,求t的值;
【方法迁移】
(3)如图,∠
,
平分
.现有射线
、
分别从
、
同时出发,以每秒
和每秒
的速度绕点
顺时针旋转,当
旋转一周时,这两条射线都停止旋转.问经过几秒后,射线
、
的夹角为
?
(4)周末的下午,小明看到钟面显示3点整,此时分针与时针的夹角恰好为900,进过 分钟后,分针与时针的夹角首次变成45°.
如图,数轴上的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
【方法迁移】
(3)如图,∠
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe7ef2639f7539cb99c215c7a7b59c2.png)
![](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/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb0aa8a61380228e285f3b5c7b74c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
(4)周末的下午,小明看到钟面显示3点整,此时分针与时针的夹角恰好为900,进过 分钟后,分针与时针的夹角首次变成45°.
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【推荐2】[探究角之间的数量关系]如图,O为直线AB上一点,
.
(1)如图1,若
,OD平分
,
,求
的度数;
(2)如图2,若
,
,请用a表示
的度数;
(3)如图3,若
,
(
且n为正整数),请用a和n表示
的度数.(直接写出结果)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcbec8352ce3dbfbf3b173045d0ba8f2.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5ae0ca3f5c9945aa044c952d31841e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e23e78c79ceffdbfd7e5db7e293174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4751e6505b79017e88542609cef5b0c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5478838889acb040fcc183011b585b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84ab8cdfe3cb0de03137897215925e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3138a056dc07f71723183e24ce05be88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc5735838e43b7a229e8f45c9bfffb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://img.xkw.com/dksih/QBM/2019/8/9/2265098832822272/2265116842532864/STEM/e42b98d0c7474f86adc74ee0b1cdef1e.png?resizew=450)
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【推荐1】综合与实践
动手操作:
第一步:把我们常用的一副三角尺按照如图1所示的方式摆放,两块三角尺的直角边
,
摆放在同一直线上,图中
,
,
.
第二步:把图1所示的
绕点
顺时针旋转得到
(如图2).
第三步:把图3所示的两块三角尺的直角边
,
摆放在同一直线上,另一条直角边
,
也放在同一条直线上,再把
绕点
顺时针旋转一周.
问题解决:
(1)如图1,
的度数是_______.
(2)如图2,当
平分
时,求
的度数.
(3)如图3,当
旋转多少度时,
,请你说明理由.
动手操作:
第一步:把我们常用的一副三角尺按照如图1所示的方式摆放,两块三角尺的直角边
![](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/19ca72acafcbb5d946711d6b50c7cb41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
第二步:把图1所示的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17feedef8b38275d0b9bf982a5478ec.png)
第三步:把图3所示的两块三角尺的直角边
![](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/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
问题解决:
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17cf8e6bfbe3b365f8e9278cc469d2b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb3dd0a5fcda9933afab5baf4ec4488.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://img.xkw.com/dksih/QBM/2021/6/27/2751965102292992/2817021584244736/STEM/77079097-9372-4644-ba5e-7c6471ce9270.png)
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【推荐2】把一副三角尺
与
按如图所示那样拼在一起,其中
、
、
三点在同一直线上,
为
的平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/60ca779d-f384-43fc-9af6-78a152216500.png?resizew=136)
(1)
的度数为______;
(2)若
为
的平分线,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/60ca779d-f384-43fc-9af6-78a152216500.png?resizew=136)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d76e136e7df3692ae6536fc70b6961a9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44d9f2b82b73e7a0917a19f74dbc5f9.png)
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解答题-证明题
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(0.65)
【推荐1】完成下面的证明.
如图,
,
分别在
和
上,
,
与
互余,
于点
.求证
.
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980655484993536/2981408261373952/STEM/54b540c8-a656-416e-b196-ce9a3a8e1402.png?resizew=229)
证明:∵
(已知),
∴
(垂直的定义).
∵
(已知),
∴__________∥_____________(______________).
∴
(______________).
又∵
(已知),
___________(平角的定义),
∴
.
∴
______________.
∴
(____________).
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/8efa4e9eebe76c572fbac1522085868b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a598a35e6a4bfb3a5f08b55b70bdc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980655484993536/2981408261373952/STEM/54b540c8-a656-416e-b196-ce9a3a8e1402.png?resizew=229)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a598a35e6a4bfb3a5f08b55b70bdc3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beccb2dcf2bcc13f5494f1e3c27bcf3f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85bae51848b49ba5630da44ac1091d9.png)
∴__________∥_____________(______________).
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cdcf3b2965480eb57318ccd34e14dc2.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e43724e211344fed172ba099a9703912.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd6ae5bcc57e4c3c03f30186877f810.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac60b47cfe79180029880869c60f8d32.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/459459559720ab5e154a80723c47cc30.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
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【推荐2】如图,直线
与直线
交于点
,射线
在
内部,
是
的平分线,且
.
,求
的度数.
(2)若
,求
的度数.
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2460507a462453e084eaf70a7d867e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0d253b61195e0eb2a1969efdbc1f11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0a64d84aa76b98ae505d9cd9a3eb4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ba128c5d1d378c90bc165d38e29aea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
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解答题-证明题
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名校
【推荐1】如图所示,在△ABC中AB=AC,AD⊥BC,BE⊥AC,AE=BE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/23a27959-8c94-4d4e-a977-48f972a6f21b.png?resizew=116)
(1)△AEH与△BEC全等吗?请说明理由;
(2)求证:AH=2CD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/23a27959-8c94-4d4e-a977-48f972a6f21b.png?resizew=116)
(1)△AEH与△BEC全等吗?请说明理由;
(2)求证:AH=2CD.
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