人教版二年级数学上册第3单元测试卷及答案
1第三单元测试卷一、填一填。1.一个直角有( )个顶点,有( )条边。2.从一个点起,用尺子向( )的方向画两条直直的线,就能画成一个角。3.一个长方形和一个正方形都有( )个角,它们都是( )角。4.要判断一个角是不是直角,可以用三角尺上的( )比一比。5.角的大小与两条边的长短( )。6.9时整时,分针和时针形成的角是( )角。二、选一选。(在括号里填上正确答案的序号)1.下图中有( )个角。①8 ②7③6 ④52.下面图形中,( )是直角。①②③④3.下面的角中,钝角是( ),锐角是( )。①②③④24.下图中,共有( )个直角。①4②6③8...
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