Final answer:
The equation for the area of a square, given the length of one of its sides, is A = l², where A is the area, and l is the side length.
Step-by-step explanation:
The student is asking how to translate the given sentence into an equation or formula that represents the area of a square. The sentence states that the area, A, of a square is equal to the length of a side, l, squared. The equation that corresponds to this description is:
A = l²
This equation shows that the area of a square (A) is found by squaring the length of one of its sides (l). Remember, when calculating the area, the units are squared as well, thus if l is in meters, the area will be in square meters.