One side of the rectangle is 3.5 cm, the area of the rectangle is 7.84 cm2, find the other side of the rectangle.

In the problem statement, we are given the area of a rectangle and one side of it. Find the length of the second side of the rectangle.
Let’s write the formula for the area of a rectangle:
S = a × b,
where a and b are the sides of the rectangle.
Suppose we know side b. Let us express side a from the formula for the area:
a = S: b.
Substituting the known values of the area and side b, we find the side a:
a = 7.84: 3.5 = 2.24 cm.
Answer: The second side of the rectangle is 2.24 cm.