A rhombus has four equal offset sides, while a parallelogram has four offset sides. Each pair of a parallelogram is parallel to each other but not equal in size.
A rhombus and a parallelogram are both considered quadrilaterals. A quadrilateral is any shape with four sides. Squares and rectangles also fit this criteria. A rhombus is a square that is leaning, while a parallelogram is a rectangle that leans. Unlike squares and rectangles, neither a rhombus nor a parallelogram have angles that equal 90 degrees, which makes them easier to recognize.
A good example of a rhombus is a diamond. The shape of a diamond has four equal sides that seem to be angled either up, down or to one side. An example of a parallelogram is a kite. The two top sides of the kite are equal to each other as are the two bottom sides, but the opposite sides are parallel to each other.
Just like a square, rectangle or any other quadrilateral, the area of the object can be found by multiplying the length of the object by its width. Regardless of whether the object is a rhombus, parallelogram, square or rectangle, the interior angles always add up to 360 degrees.