人教版二年级数学上册-单元测试卷-角的初步认识-第3单元跟踪检测卷+答案
第3单元跟踪检测卷一、填一填。(每空1分,共15分)1.∠1是( )角,∠2是( )角,∠3是( )角,∠4是( )角。2.一张长方形纸有( )个角,一条红领巾有( )个角。3.锐角比直角( ),( )角比直角大。4.从一点起,用尺子向( )的方向画两条笔直的线,就能画成一个角。5.猜一猜,被纸卡遮住的分别是什么角?6.右图中一共有( )个角,其中有( )个直角。7.右图中有( )个直角。 二、辨一辨。(对的画“√”,错的画“×”)(每题1分,共5分)1.角所画出的两条边越长,这个角就越大。( )2.长方形和正方形都有4个直角。( )3....
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