在“组合图形”教学中,练习量相对较大,使用工具较多,因此,我设计了形象直观的趣味折叠式卡片,大大促进了课堂效益的提高。 基本图:该图一面阴影,一面白色,沿双线、虚线处可里外翻动。此卡片可巧妙折叠,以一当十,用以计算各种图形的面积和周长。 In the “combined graphics” teaching, relatively large amount of exercises, the use of more tools, therefore, I designed the image intuitive fun folding card, which greatly promoted the classroom to improve efficiency. The basic map: The figure side of the shadow, white side, along the two lines, the dotted line can be inside and outside the flip. This card can be cleverly folded to one when ten, used to calculate the area and perimeter of various graphics.