How can you tell the difference between a rectacle and rhombus

A square is a type of rectangle, just one where all four sides are the same length. Finally, there's the rhombus, which is a four-sided shape with sides of equal length. The angles can be 90 degrees, but they don't need to be. So, a square is a rhombus, but not every rhombus is a square.

Rectangles have 90 degree angles, rhombus's don't ...