3 x 4 = 12 because there are 4 sides and the length is 3, you multiply 3 and 4 together.
Answer:
Perimeter of square=12x
Step-by-step explanation:
the perimeter of a square with sides of length 3x
The side length of the square is 3x
To find perimeter we add all the sides. All sides are same in a square.
Perimeter of square= 4(a)
where 'a' is the side length
a= 3x. Substitute 3x for 'a'
Perimeter of square= 4(3x)=12x
