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“三角形面积”这节课的内容是在学生掌握了长方形、平行四边形面积计算方法的基础上进行教学的。本节课的教学目标是理解三角形面积计算公式的推导过程并掌握三角形面积的计算方法。我在这节课的教学中，充分发挥教师的主导作用和学生的主体作用；让学生动手操作，通过剪一剪?
The content of the “Triangle Area” lesson is based on the students having mastered the method of calculating the area of a rectangle and parallelogram. The teaching goal of this lesson is to understand the derivation of the triangle area formula and to know how to calculate the area of the triangle. I teach in this class, give full play to the leading role of teachers and the main role of students; let students hands-on operation, by cutting?