a circle is a curved shape with no angels and a rhombus is a polygon with four angles
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Diamond is another name for rhombus.
the shape
A rhombus has 4 sides of equal length and may be crooked and a rectangle must have four 90 [[Q/Whats the difference between a rectangle and a rhombus#|degree]] angles. A square is both a rectangle and a rhombus.
A rhombus is a two dimensional object, a rhomboid is 3 dimensional. The relation between the two is the same as that between a square and a cube.
Rhombuses always have 4 equal sides, trapezoids do not.