How do you find the circumference of a rhombus?

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.