1 . 【问题初探】数学课上,老师和学生做数学书39页的做一做的内容
如图,打台球时,选择适当的方向击打白球,白球反弹后击打红球,红球会直接入袋,此时,
.
(1)若
,则
;
(2)
的余角是_________;
【学科融合】
物理学中把经过入射点
并垂直于反射面的直线
叫做法线,入射光线与法线的夹角
叫做入射角,反射光线与法线的夹角
叫做反射角(如图①).由此可以归纳出如下的规律:在反射现象中,反射光线、入射光线和法线都在同一平面内;反射光线、入射光线分别位于法线两侧:反射角等于入射角.这就是光的反射定律(rfectionlaw).
【数学推理】
(3)如图1,有两块平面镜
,且
,入射光线
经过两次反射,得到反射光线
.由以上光的反射定律,可知入射角与反射角相等,进而可以推得他们的余角也相等,即:
.在这样的条件下,求证:
.
【尝试探究】
(4)两块平面镜
,且
,入射光线
经过两次反射,得到反射光线
.如图2,光线
与
相交于点
,则
_________;(用含有字母
的式子表示)
如图,打台球时,选择适当的方向击打白球,白球反弹后击打红球,红球会直接入袋,此时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ed90989ab02caf1b79f9b8f1bd53d2.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/190d6f894c8c1d323db44fdd3488e2fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5ffd2bf996098b054f6f8e2176abdc.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
【学科融合】
物理学中把经过入射点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
【数学推理】
(3)如图1,有两块平面镜
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f65dbed884e2248ec075655c684aa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0b06dc01c30d13f64be2ac6a1d811e.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/9fc16bf53f6b6a6a40c2ebb575956dda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
【尝试探究】
(4)两块平面镜
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f65dbed884e2248ec075655c684aa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84261efd0ff6fafdc55cd446c1a5f68.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8cfb5b3f527ff16771f6cb4741f19bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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2 . 如图,
,点
,
在直线
上,点
在直线
上,
,若
,则
的度数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc8444d63d1ca92651c62fe9b220859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee91c610227e28a80d56776a427e1513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17ff7f305c47e1b2d1b510293edb770.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 已知
和
互余,若
,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21c0726579eadb28c3c7eb9576dcd6af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 .
与
互为余角.若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54ccc7d2f8af35a252977d6e2af4663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 下列命题是真命题的是( )
A.钝角没有余角 | B.同旁内角相等,两直线平行 |
C.若![]() ![]() | D.过一点有且只有一条直线与已知直线平行 |
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6 . 如图,在
中,
,过点
作
于点
,若
,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/4ce6c8659bfef1f79b0796d500b924a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 一个角的度数为
,则它的余角的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e47e80120afb8d7797daa39d54170dc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 .
度,则它的余角的补角等于___________ 度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b66039eb05203757c3addc62a8c88a.png)
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9 . 如图,直线
相交于点O,
于点O.
,求
的度数;
(2)若
,求
的度数;
(3)在(2)的条件下,如果过点O作直线
,并在直线
上取一点
(点F与点O不重合),求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caea4e41982e2c5fe0a0c7e73af69c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8fcfbfae80998aa7bc7f096c756371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f84f63e52dbca6fbc9bd820a570f264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
(3)在(2)的条件下,如果过点O作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f479d987bc7abd828c64f9dc745836ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
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