Find the perimeter of the rhombus if the side of the rhombus is 5.5 cm.

A rhombus is a quadrilateral in which all sides are equal and opposite sides are parallel.
The perimeter of any geometric shape is the sum of the lengths of all its sides. Let’s write down the formula for the perimeter of a rhombus:
P = 4 × a,
where P is the perimeter and a is the length of the rhombus side.
We calculate the perimeter of the rhombus, substituting the length of the side into the formula:
P = 4 × 5.5 = 22 cm.
Answer: the perimeter of the rhombus, with a side of 5.5 cm, is 22 cm.