Perimeter of a square is 4s where s is the length of a side
If s=5 perimeter is 4x5=20
If s=6 perimeter is 4x6=24
If s=7 perimeter is 4x7=28
If s=8 perimeter is 4x8=32
If s=9 perimeter is 4x9=36
If s=10 perimeter is 4x10=40
If s=11 perimeter is 4x11=44
If s=12 perimeter is 4x12=48
If s=13 perimeter is 4x13=52
If s=14 perimeter is 4x14=56
If s=15 perimeter is 4x15=60
If s=16 perimeter is 4x16=64
If s=17 perimeter is 4x17=68
If s=18 perimeter is 4x18=72