PLEASE HELP!!! ILL GIVE BRANLIEST *EXTRA POINTS* dont skip :((

Answer:
48 Ft
Step-by-step explanation:
If the base is a square than you figure out what number multiplied by itself is equal to 144 and since a square has 4 side you do 12x4 which equals 48. P.S. 12x12 is 144!
Hope that helped!