如图①,在平面直角坐标系中,
,且满足
,过C作
轴于B.
_______;
(2)如图②,若过B作
交y轴于D,且
分别平分
,
,求
的度数;
(3)在y轴上是否存在点P,使得
?若存在,求出P点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e92096375c8de6881b66bde8efc168a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370b24fd71d685c81725cabc1474f752.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02db4a8c065ddf418ce67b8a98a29c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42acd3ee01d9f843a8579ffb0b7d9d82.png)
(2)如图②,若过B作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c631670e02d2a38e9c78708a3916140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a56dec16d1d3b76a2a292293d09907e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e69a60fb95f19ae60c08e22f3fd5cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
(3)在y轴上是否存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1fa75e3e591b8fdcb4e284e49aad7fb.png)
更新时间:2024-05-03 20:46:33
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相似题推荐
解答题-问答题
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(0.4)
【推荐1】如图,在以点
为原点的平面直角坐标系中,有一个长方形
,
,
,且
.点
是
边上的一点,且
,动点
从
点出发,以每秒2个单位长度的速度沿
运动,最终到达点
.设点
运动的时间为
秒.
______,
______;
(2)当
时,求
的面积;
(3)是否存在
点使
的面积等于20,若存在,请求出
点坐标.若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa375c3888b332f24e7d0f9b9600c694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890aea25780f7ba34adb23e799808462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9141fea4eed5b7e66dc0a106da834907.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/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a11585965a676bc532313ce5622ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d535a4d2666de49bb57c25c8808f0feb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
(3)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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名校
【推荐2】如图,在平面直角坐标系中,O为坐标原点,点A和点B分别在y轴和x轴上,连接
,点C为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/fb9c76d4-aa6d-4c3f-be07-222fe1d20588.png?resizew=452)
(1)求点C坐标;
(2)点P从点O出发沿x轴正方向以每秒2个单位的速度运动,连接
、
,点P的运动时间为t秒,
的面积为S,求用含t的式子表示S;
(3)在(2)的条件下,在y轴负半轴上有一点Q,连接
,过点A作
于点D,
与
交于点E,与x轴交于点F,当
时,
,求此时点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb6ed4dfc6d7698e428943d500d25da.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/fb9c76d4-aa6d-4c3f-be07-222fe1d20588.png?resizew=452)
(1)求点C坐标;
(2)点P从点O出发沿x轴正方向以每秒2个单位的速度运动,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
(3)在(2)的条件下,在y轴负半轴上有一点Q,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8337ce666eae701dcbc8d80ea0de4e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82cb92fa6e6250988b675c84d2c60aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ecd3a5af81799d5008abc3d343b04d.png)
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【推荐1】在综合与实践课上,班级开展了以两条平行线和直角三角尺为主题的数学活动.
【初步感知】(1)如图1,若三角尺的
角的顶点G放在
上,若
,则
的度数为_________;
【自主探究】(2)将一副三角板如图2所示摆放,直线
.若三角板
不动,而三角板
绕点D以每秒
的速度顺时针旋转,设旋转时间为t秒
,求当旋转到
时,
的值是多少?
【探究拓展】(3)现将三角板
绕点A以每秒
的速度顺时针旋转,同时三角板
绕点D以每秒
的速度顺时针旋转,如图3,设时间为t秒,当
时,若边
与三角板
的一条直角边(边
)平行,求出所有满足条件的
值.(请直接写出满足条件的
值)
【初步感知】(1)如图1,若三角尺的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54eb639802989aa4b8e541734ec00f7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
【自主探究】(2)将一副三角板如图2所示摆放,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8be88ce325838b79a377e026a437ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654c79a470d5af5e0a34fd9233da5118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2458dcb3c851088e76c696c6bdd7a916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1192fc83f2c50f64fcfa5c86f2a741e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
【探究拓展】(3)现将三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a840804ee07144f46c9c2a33e33ae450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654c79a470d5af5e0a34fd9233da5118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b89f8f2e2b52c398564ce7dae4b2be51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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较难
(0.4)
【推荐2】综合与探究
在综合与实践课上,老师让同学们以“两条平行线和一副三角板的摆放”为主题展开活动.
角的直角三角板的斜边
与
重合,含
角的直角三角板的一个顶点
在直线
上,已知
,求
的度数.
(2)如图2,在图1的基础上,直角三角板
固定不动,让直角三角板
绕着点
逆时针方向旋转,使得点
恰好在
上,边
与
交于点
,猜想
与
之间的数量关系,并说明理由.
(3)在图1的基础上,如图3,仍然让直角三角板
固定不动,直角三角板
绕着点
逆时针旋转(旋转度数小于
),设边
(或
的延长线)与
相交于点
,当斜边
与另一直角三角板的某一边平行时,直接写出
(即
)的度数.
在综合与实践课上,老师让同学们以“两条平行线和一副三角板的摆放”为主题展开活动.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f64c372f6162c32675bfc005cffa6956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.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/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
(2)如图2,在图1的基础上,直角三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714afe6b1150b30af6e0b203a3eaf04b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4034b3df6f8e540951e48b71c6ebbb29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
(3)在图1的基础上,如图3,仍然让直角三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714afe6b1150b30af6e0b203a3eaf04b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1828e73ec5e00f95aa11ff74c703a5c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab39196b6d9fd7b72e589fd25266ead4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
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