课题的确定对于长方形、正方形、三角形、平行四边形、梯形等规则平面图形,学生已经有了初步的认识,并能够利用公式准确地计算出它们的面积。但在生活中,学生接触更多的是不规则图形,如何计算它们的面积?孩子们对此有极大的兴趣。为了引导学生学会计算不规则图形面积的方法,笔者选择了孩子们司空见惯的树叶来进行研究,并确立了“树叶有多大”这个课题。课题的布置与指导 Confirmation of Questions For students to have a regular understanding of regular flat shapes such as rectangles, squares, triangles, parallelograms, trapezoids, etc., and to be able to use formulas to accurately calculate their area. But in life, students come into contact with more irregular graphics, how to calculate their area? Children have great interest in this. In order to guide students to learn the method of calculating irregular graphic area, I chose to study children’s common leaves, and established “leaves how ” this issue. The layout and guidance of the subject