Well, "circumference" is a word that's reserved for circles. If you want the distance all the way around a rhombus, that's called the "perimeter" of the rhombus.
To find it, you need to know the length of one side. Then, since a rhombus has 4 sides and they're all the same length, you just multiply the length you have by 4 .
To find the perimeter of a rhombus, multiply the length of one side by 4, since all sides are equal. For example, if one side is 5 cm, the perimeter is 20 cm. The formula is P = 4 s .
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