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一、合作探究 ,寻找联系 师 :根据同学们的意见 ,我们先研究圆与转化成的平行四边形的关系。圆的形状变了 ,它的面积怎么样 ? 生 :形状变 ,面积不变。圆的面积 =平行四边形的面积。 师 :平行四边形的面积 =底×高。如果求得平行四边形的面积也就求出了圆的面积。那
First, to explore cooperation and find contact division: According to the students' opinions, we first study the relationship between the circle and the converted parallelogram. The shape of the circle has changed, how is its area? Health: Shape change, the same area. Area of circle = area of parallelogram. Teacher: The area of the parallelogram = bottom × height. If you find the area of the parallelogram also found the circle area. that