2019年人教版数学四年级上册3.3 角的度量练习卷（含解析）（I）卷
姓名:________ 班级:________ 成绩:________
![](https://wkrtcs.bdimg.com/rtcs/image?w=60.80&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"60.80","h":"52.73","dataType":"gif","c":"word/media/image1.gif"})
小朋友，带上你一段时间的学习成果，一起来做个自我检测吧，相信你一定是最棒的！
一、选择题
1 . 下列各组线段中，能围成三角形的是（ ）
A．3 cm，4 cm，5 cm |
B．4 cm，5 cm，10 cm |
C．6 cm，4 cm，10 cm |
2 . 下列说法正确的是（ ）
A．直线比射线长 |
B．大于90°的角就是钝角 |
C．角的大小与角的两边画出的长度无关 |
3 . 如图中，∠1等于（ ）.
![](https://wkrtcs.bdimg.com/rtcs/image?w=98.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_11","w":"98.00","h":"68.00","dataType":"png","c":"word/media/image2.png","imgOriW":98,"imgOriH":68})
A．15° | B．45° | C．60° | D．以上都不对 |
4 . 边长4cm的正方形的直角与边长2cm的正方形的直角，（ ）。
A．两个直角一样大 | B．边长4cm的直角大 | C．边长2cm的直角大 | D．无法比较 |
二、填空题
5 . 下图中共有（____）个角，其中直角有（_____）个，锐角有（_____）个。![](https://wkrtcs.bdimg.com/rtcs/image?w=60.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_11","w":"60.00","h":"41.00","dataType":"png","c":"word/media/image3.png","imgOriW":60,"imgOriH":41})
6 . 比90°大，比180°小的角是_____．
7 . 一个三角形，其中一个内角是40°，另外两个内角度数的比是3:4，这两个内角的度数分别是（_____）和（________）。
8 . 乐乐按2∶1的比例放大一个40°的角，放大后这个角的度数是（_______）．
9 . 从3：00走到3：15，分针转动了_____度．
三、判断题
10 . 三角尺上的直角小于课本上的直角。（____）
11 . 把半圆分成180等份，每一份所对的角叫做1度的角．___．
12 . 用5倍的放大镜看一个30°的角，看到的角是150°。（____）
四、解答题
13 . 我会量。
（1）.量一量，填一填。
①∠1= ∠2= ∠3= ∠1+∠2+∠3=
![](https://wkrtcs.bdimg.com/rtcs/image?w=139.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_11","w":"139.00","h":"80.00","dataType":"jpeg","c":"word/media/image4.jpeg","imgOriW":139,"imgOriH":80})
②∠1= ∠2= ∠3= ∠1+∠2+∠3=
![](https://wkrtcs.bdimg.com/rtcs/image?w=159.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_1","w":"159.00","h":"57.00","dataType":"jpeg","c":"word/media/image5.jpeg","imgOriW":159,"imgOriH":57})
（2）.你发现了什么规律？
14 . 已知∠1=90°∠2=50° 求∠3．
![](https://wkrtcs.bdimg.com/rtcs/image?w=187.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_1","w":"187.00","h":"115.00","dataType":"png","c":"word/media/image6.png","imgOriW":187,"imgOriH":115})
15 . 拿一张长方形的纸，折出它的![](https://wkrtcs.bdimg.com/rtcs/image?w=10.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_1","w":"10.00","h":"35.00","dataType":"png","c":"word/media/image7.png","imgOriW":10,"imgOriH":35})
．试试能用几种不同的折法折出来．
16 . 以A为顶点画出35°的角，以B为顶点画出40°的角，再量一量画出的两条射线所组成的角是多少度？再经过两条射线的交点画出线段AB的垂线。![](https://wkrtcs.bdimg.com/rtcs/image?w=414.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_1","w":"414.00","h":"18.00","dataType":"png","c":"word/media/image8.png","imgOriW":414,"imgOriH":18})
参考答案
一、选择题
1、![](https://wkrtcs.bdimg.com/rtcs/image?w=62.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"62.00","h":"26.00","dataType":"png","c":"word/media/image9.png","imgOriW":62,"imgOriH":26})
2、![](https://wkrtcs.bdimg.com/rtcs/image?w=62.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"62.00","h":"26.00","dataType":"png","c":"word/media/image10.png","imgOriW":62,"imgOriH":26})
3、
4、![](https://wkrtcs.bdimg.com/rtcs/image?w=62.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"62.00","h":"26.00","dataType":"png","c":"word/media/image11.png","imgOriW":62,"imgOriH":26})
二、填空题
1、![](https://wkrtcs.bdimg.com/rtcs/image?w=85.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"85.00","h":"26.00","dataType":"png","c":"word/media/image12.png","imgOriW":85,"imgOriH":26})
2、![](https://wkrtcs.bdimg.com/rtcs/image?w=75.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"75.00","h":"26.00","dataType":"png","c":"word/media/image13.png","imgOriW":75,"imgOriH":26})
3、![](https://wkrtcs.bdimg.com/rtcs/image?w=94.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"94.00","h":"26.00","dataType":"png","c":"word/media/image14.png","imgOriW":94,"imgOriH":26})
4、![](https://wkrtcs.bdimg.com/rtcs/image?w=72.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"72.00","h":"26.00","dataType":"png","c":"word/media/image15.png","imgOriW":72,"imgOriH":26})
5、![](https://wkrtcs.bdimg.com/rtcs/image?w=68.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"68.00","h":"26.00","dataType":"png","c":"word/media/image16.png","imgOriW":68,"imgOriH":26})
三、判断题
1、![](https://wkrtcs.bdimg.com/rtcs/image?w=61.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"61.00","h":"26.00","dataType":"png","c":"word/media/image17.png","imgOriW":61,"imgOriH":26})
2、![](https://wkrtcs.bdimg.com/rtcs/image?w=61.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"61.00","h":"26.00","dataType":"png","c":"word/media/image18.png","imgOriW":61,"imgOriH":26})
3、![](https://wkrtcs.bdimg.com/rtcs/image?w=61.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"61.00","h":"26.00","dataType":"png","c":"word/media/image19.png","imgOriW":61,"imgOriH":26})
四、解答题
1、![](https://wkrtcs.bdimg.com/rtcs/image?w=232.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"232.00","h":"47.00","dataType":"png","c":"word/media/image20.png","imgOriW":232,"imgOriH":47})
2、![](https://wkrtcs.bdimg.com/rtcs/image?w=96.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"96.00","h":"26.00","dataType":"png","c":"word/media/image21.png","imgOriW":96,"imgOriH":26})
3、![](https://wkrtcs.bdimg.com/rtcs/image?w=435.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"435.00","h":"154.00","dataType":"png","c":"word/media/image22.png","imgOriW":435,"imgOriH":154})
4、![](https://wkrtcs.bdimg.com/rtcs/image?w=291.00&md5sum=01c7e1d8bbefbb95ce48bb2154caa007&sign=45723e9564&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=257&ipr={"t":"img","r":"r_5","w":"291.00","h":"109.00","dataType":"png","c":"word/media/image23.png","imgOriW":291,"imgOriH":109})
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