Solution:
Make a rectangle with 24 squares with a side length of 3 meters. In order to make the perimeter of the rectangle shortest, the length and width of the rectangle need to be close.
24=24× 1= 12×2=8×3=6×4。
Therefore, it can be properly assembled into a 6×4 rectangle with the shortest circumference. At this time, the length of the rectangle is 6×3= 18 decimeter. The width of the rectangle is 4×3= 12 decimeter.
Circumference =2×( 18+ 12)=60 decimeters.
Mathematical geometry formula of primary school
Circumference:
1, the perimeter of the rectangle = (length+width) ×2 = 2(a+b) = (a+b)×2.
2. The circumference of a square = side length ×4 = 4a.
3. The circumference of a circle = pi× diameter = π d = pi× radius× 2 = 2π r.
Refer to the above information? Baidu Encyclopedia-Mathematical Formula