我们这里过新年 ,亲戚朋友之间都要相互赠送礼物庆贺 ,礼物中白糖是不能少的 .取一张边长为 3 0ｃｍ正方形的厚草纸 (或牛皮纸 ) ,用来包白糖 ,求白糖的体积 .这是我们在上了《立体几何》之后进行的一次数学应用活动 .为了运算和操作方便 ,我们约定 :(1 )所做的几何体为书本中? We are here in the New Year, and friends and relatives must give each other gifts to celebrate. The sugar in the gift is not small. Take a piece of thick straw paper (or kraft paper) with a side of 30cm squares to wrap the sugar and find the volume of sugar. This is a mathematics application activity that we carried out after we had “3D Geometry.” For the sake of computation and ease of operation, we agreed that: (1) What is the geometry of the book?