面积

面积是表示平面上二维表面或形状，或平面薄片的大小的量。面积可以理解为用一定厚度的材料制作形状模型所需的量，或者用一层涂料覆盖表面所需的量。[1]它是曲线长度（一维概念）或固体体积（三维概念）的二维类比。

Area is a quantity that expresses the extent of a two-dimensional surface or shape, or planar lamina, in the plane. Area can be understood as the amount of material with a given thickness that would be necessary to fashion a model of the shape, or the amount of paint necessary to cover the surface with a single coat.[1] It is the two-dimensional analog of the length of a curve (a one-dimensional concept) or the volume of a solid (a three-dimensional concept).