(It also depends the shape of the figure the equation changes like this : b×B ² or P×A or other things)

Im not a 5th grader
Im a 1st grader of secundary
(Idk how its called in english i think its secondary)

I meant a easy equation there L=lado(spanish)
Lado = side
Side×4= L+L+L+L
L+L+L+L =
The resault changes but the equation does not
If a square is 16×4L = 16+16+16+16
16+16+16+16 = 64
Wich means L+L+L+L=64 OR 16×4L=64

My brain makes it all complicated