“扇形的面积”是初中二年级数学教材中的教学内容。这课教学的知识目标是:学习、掌握扇形面积公式的推导过程,初步运用扇形面积公式进行相关计算。因为在以前的学习中,学生已经熟练掌握了圆的面积公式,所以我认为,这一教学内容对学生来说应该很好掌握,只要 “Fan-shaped area ” is the teaching content of the second grade junior high school mathematics textbooks. The goal of this teaching is to learn and master the derivation process of the fan area formula and to make preliminary calculations based on the fan area formula. Because in previous studies, students had mastered the formula of the area of ​​a circle, so I think that this teaching content should be very good for students, as long as