二年级数学—角的认识思维题
基础过关】
1、画角．
（1）画一个直角． （2）画一个比直角大的角． （3）画一个锐角．
2、数一数。
![](https://wkrtcs.bdimg.com/rtcs/image?w=183.00&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","w":"183.00","h":"89.00","dataType":"png","c":"word/media/image1.png","imgOriW":276,"imgOriH":134})
上图中，有（______）个直角，（______）个钝角，（______）个锐角，一共有（______）个角。
3、画角时先画( ),再画( )。（ ）
A．两条边、顶点 B．直线、点 C．顶点、两条边 D．点、直线
思维提升训练
例1】封闭图形数角
数一数，下面图形中各有几个角？
![](https://wkrtcs.bdimg.com/rtcs/image?w=367.00&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","w":"367.00","h":"97.00","dataType":"png","c":"word/media/image2.png","imgOriW":495,"imgOriH":130})
（______）个 （______）个
![](https://wkrtcs.bdimg.com/rtcs/image?w=367.00&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","w":"367.00","h":"99.00","dataType":"png","c":"word/media/image3.png","imgOriW":452,"imgOriH":123})
（______）个 （______）个
2、数一数。
![](https://wkrtcs.bdimg.com/rtcs/image?w=191.00&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","w":"191.00","h":"89.00","dataType":"png","c":"word/media/image4.png","imgOriW":191,"imgOriH":89})
图中有________条线段，有________个直角。
变式训练
1、．在下边的图中一共有（ ）个锐角。
![](https://wkrtcs.bdimg.com/rtcs/image?w=137.00&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","w":"137.00","h":"80.00","dataType":"png","c":"word/media/image5.png","imgOriW":137,"imgOriH":80})
A．4 B．5 C．7 D．6
2、图中有（______）条线段，有（______）个角，其中有（_______）个直角．
![](https://wkrtcs.bdimg.com/rtcs/image?w=128.00&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","r":"r_7","w":"128.00","h":"64.00","dataType":"png","c":"word/media/image6.png","imgOriW":128,"imgOriH":64})
3、数一数，一共有多少个三角形．
![](https://wkrtcs.bdimg.com/rtcs/image?w=126.00&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","w":"126.00","h":"96.00","dataType":"png","c":"word/media/image7.png","imgOriW":126,"imgOriH":96})
（ ）个 （ ）个
例2】百变图形
1、变一变．
(1)画一条线．
![](https://wkrtcs.bdimg.com/rtcs/image?w=500.00&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","w":"500.00","h":"105.87","dataType":"png","c":"word/media/image9.png","imgOriW":1246,"imgOriH":263})
(2)画两条线．
![](https://wkrtcs.bdimg.com/rtcs/image?w=504.00&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","w":"504.00","h":"106.67","dataType":"png","c":"word/media/image10.png","imgOriW":1300,"imgOriH":274})
(3)将一张正方形纸，按要求去掉一个角，可以怎样剪？画一画．
![](https://wkrtcs.bdimg.com/rtcs/image?w=448.07&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","r":"r_7","w":"448.07","h":"119.27","dataType":"png","c":"word/media/image11.png","imgOriW":651,"imgOriH":229})
参考答案】
基础过关】
1、（1）![](https://wkrtcs.bdimg.com/rtcs/image?w=69.00&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","w":"69.00","h":"71.00","dataType":"png","c":"word/media/image12.png","imgOriW":69,"imgOriH":71})
（2）（3）
2、3 2 4 10
3、C
思维提升
例1】
1、7 8 9 6
2、9 2
变式训练
1、D
2、 8 3
3、13个 8个
例2】
(1)
![](https://wkrtcs.bdimg.com/rtcs/image?w=360.07&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","w":"360.07","h":"76.20","dataType":"png","c":"word/media/image15.png","imgOriW":912,"imgOriH":193})
(答案不唯一)
(2)
![](https://wkrtcs.bdimg.com/rtcs/image?w=318.07&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","w":"318.07","h":"95.53","dataType":"png","c":"word/media/image16.png","imgOriW":830,"imgOriH":250})
(答案不唯一)
(3)
![](https://wkrtcs.bdimg.com/rtcs/image?w=299.07&md5sum=e8c41a68f44ed1bc4f28d25ba58e9dad&sign=bbc3f37c0c&rtcs_flag=2&rtcs_ver=4&l=webapp&bucketNum=609&ipr={"t":"img","w":"299.07","h":"96.80","dataType":"png","c":"word/media/image17.png","imgOriW":878,"imgOriH":285})
(答案不唯一)
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