The perimeter of a rectangle is the sum of the lengths of all its sides. Since in a rectangle the opposite sides are equal, the perimeter is equal to twice the sum of the length and width. Formula for finding the perimeter: P = 2 * (a + b), where a is the length, b is the width. Knowing that the sum of the adjacent sides of the rectangle, that is, the length and width is 5 cm, we calculate what the perimeter of the rectangle is.
P = 2 * 5 = 10 cm.
Answer: 10 cm.
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