When 2 pieces of calligraphy are put together into a square, the surrounding lace is at least
, so the length of a 4×5 rectangle is 5×2=1 decimeters, and the width is 4×2=8 decimeters
The lace is at least =2×(1+8)=36 decimeters. Extended data
The area formula of a 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).
A square is a special rectangle, with rectangular area = rectangular area = length × width;
represented by letters is: S=ab(S represents the area of rectangle, a represents the length of rectangle, and b represents the width of rectangle).