So it is a 4x5 rectangle.
The length is 5×2= 10 decimeter, and the width is 4×2=8 decimeter.
Minimum lace value =2×( 10+8)=36 decimeters.
The area formula of the extended data square is: area = side length? , expressed in letters is: S=a? (s refers to the square area and a refers to the side length of the square).
Square is a special rectangle, special rectangle, rectangular area = rectangular area = length × width;
Represented by letters: S=ab(S represents the area of the rectangle, A represents the length of the rectangle, and B represents the width of the rectangle).