在教学角的分类时,教师组织学生先制作活动角,再引导学生摆弄活动角。在活动的过程中,引导学生慢慢转动活动角的一边,依次认识锐角、直角、钝角、平角和周角,最后总结出它们的大小关系:锐角<直角<钝角<平角<周角。因为经历了活动角的学习过程,所以学生对于各类角的认识都比较深刻。“老师,有比周角大的角吗?”听到朱晓轩的问话,班里霎时寂静无声,四十六双眼睛 In the classification of teaching angle, teachers organize students to make activity angle, and then guide students to play with activity corner. In the course of activities, the students are guided to slowly turn the side of the active corner, and then the acute angle, the right angle, the obtuse angle, the flat angle and the circumference angle are summarized, and finally their size relationship is concluded: acute angle