To solve this problem, recall the formula for the area of a rectangle. The area of the rectangle is equal to the product of the length and the width. S = a * b, where a is the length and b is the width. Knowing that the area is 7.84 square centimeters, and one side is 3.5 cm, we calculate the second side.
a = 7.84 / 3.5 = 2.24 centimeters.
Answer: 2.24 centimeters.
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