A rhombus is defined as being any parallelogram with four equal sides.
A square is one such figure and has four 90º angles. Every other rhombus will have two equal obtuse and two equal acute angles, until the figure becomes a straight line.
You can envision this by making a rhombus out of four attached popsicle sticks in a square configuration and adjusting them until they become a straight line (or nearly so, since they won't be able to completely overlap due to their thickness - a rhombus, however, is a two dimensional figure, that can overlap.
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All rhombuses are NOT squares.
Squares always have 4 interior angles which each measure 90°; rhombuses do not.
sometimes
No
they do not have anything in common