二年级数学下册六《认识图形》认识角课课练北师大版.doc

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1认识角一、填一填。1. 一条红领巾有( )个角最大的那个角是( )角;一面国旗有( )个角,国旗上的角都是( )角。2. 一个三角板上最( )的那个角是直角。3. 右边的钟表时间是( )时,分针和时针形成( )角。4. 要知道一个角是不是直角,可以用三角板上的( )比一比。二、找出下列图形中的钝角。钝角: 3、给下面的锐角画上“” ,直角画上“” ,钝角画上“” 。( ) ( ) ( ) ( )( ) ( ) ( ) ( )四、在下图所示的时刻中,时针和分针所形成的角属于什么角? 五、数一数,下面各图中共有多少个角? 2( )个角 ( )个角 ( 个角参考答案一、1. 3,钝;4,直。2. 大。3. 3,直。4.直角。二、4 7 8 三、 () () ( ) ( ) () () ( ) ()四、锐角 钝角 直角 五、12 10 8 3

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