The area of the rectangle is square meters, and its length is 12 m, what is its perimeter?

The condition does not contain data on the area of the rectangle. Let’s assume that it is equal to 96 m² and we will solve the problem with such an area.
From the formula for the area of a rectangle, we find the width:
S = a * b, → b = S / a = 96/12 = 8 (m).
Knowing both the length and width, we find the perimeter:
P = 2 * (a + b) = 2 * (12 + 8) = 40 (m).
Answer: the perimeter is 40 meters.