Ningning is like some cardboard as shown in the picture. Male ... I'm going to choose five of them to make a rectangular carton without a lid.
10-4-4=2 (cm)
20-4-4= 12 (cm)
Length: 12
Width: 2
G: 4
12*2*4=96 (cubic centimeter)
Hope to adopt
If you don't understand, you can ask again