“面积”这个概念,似乎大家都很清楚;想一想,也似乎很直观,但是,要用语言说一说,反倒“说也说不清楚了”。教材中说:物体的表面或者封闭图形的大小,就是它的面积。维基百科说:面积是二维图形大小的量度;又说,表面积是三维物体的二维表面的大小量度。“封闭”二字根本没有出现。《数学辞海》给出了两个概念,一个是通俗的:物体表面或 It seems that everyone is aware of the concept of “area ”, and it seems intuitive to think about it. However, to use language to say “instead of saying it is unclear ”. Textbook said: the size of the surface of the object or the enclosed figure, is its area. Wikipedia says: An area is a measure of the size of a two-dimensional figure; also, a surface area is a measure of the size of a two-dimensional surface of a three-dimensional object. “Closed ” The word did not appear. Mathematical Cihai gives two concepts, one is popular: the surface of the object or