Question

Rachel has 21 inche Beats she wants to use all of them to make a square picture frame what will be the length of each side ?

Answer 1

5 1/4 inch.... You basically dicide 21 by 4 because a square has for sides

Answer 2

This is the best I can think of. Hope this helps.
A square has equal length of side. (4)
So, 21 divided by 4 = 5.25 inches each side