二年级数学下册六《认识图形》认识直角练习北师大版.doc

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1认识直角轻松准备直角、锐角和钝角比赛看谁跑得快。砰!只听裁判员一声枪响,他们都往前冲去。直角认为自己跑得最快,但是它的步子没有钝角大。锐角的脚小,步子也小。钝角迈着很轻盈的大脚丫,自信地冲向终点。广播里响起了“加油!加油!”的呐喊声。聪明的小朋友,你认为谁会是这场比赛的冠军呢?答案钝角快乐学习1. 填一填。2选择。(1)下面( )图上有直角。(2)把直角、锐角、钝角的大小按照一定的顺序排列起来,正确的是 ( )钝角锐角直角 钝角直角锐角锐角钝角-直角3.你能帮助“角”们找到自己的家吗?24将下列各角的序号按照从大到小的顺序排列起来。拓展练习5 (计数题)仔细观察下面的图形,数一数,各有几个什么角?答案与点拨1(1)3 1 2(2)钝(3)直(4)钝2(1)(2)3钝角:锐角: 直角:34.22 24 23 215(1)6 1 (2)2 3 1

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