正方形和长方形的面积

计算该图形的面积。

Calculate the area of the shape.

什么是面积？

What is area?

• 面积是物体的重量。

  Area is the weight of the object.

• 面积是平面图形所占据的空间大小。

  Area is the size of the surface of a plane figure or object.

• 面积是图形的边长总和。

  Area is the total length of the side of shape.

• 面积是三维空间的体积。

  Area is the volume of a 3D shape.

计算该明信片的面积。

Calculate the area of the letter.