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“平行四边形的面积”一课在“图形与几何”知识体系中占有重要的地位,是在学生已经掌握并能灵活运用长方形面积计算公式和理解平行四边形特征的基础上进行学习的,能为学生后面学习三角形、梯形、圆等平面图形乃至立体图形的表面积奠定良好的基础。由此可见,本课的教学尤为重要,但是该如何设计本节课的教学,却始终困扰着我。
“The Area of Parallelograms” occupies an important position in the “Graph and Geometry” system of knowledge and is based on the knowledge that students have mastered and can flexibly use the rectangular area formula and understand the characteristics of parallelograms , Which can lay a good foundation for students to study the surface area of triangle, trapezoid, circle and other planar graphics and even three-dimensional graphics. This shows that the teaching of this lesson is particularly important, but how to design the teaching of this lesson has always bothered me.