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A pentagon has five sides but a rhombus has only four. Additionally, all 4 sides of a rhombus must have the same length, while a pentagon's 5 sides can have different lengths (if they all have the same length, it is a regular pentagon).
A pentagon has 5 interior angles that add up to 540 degrees A rhombus has 4 interior angles that add up to 360 degrees
Since a rhombus has four sides, you are asking for the name of a five-sided shape, which is called a pentagon. There is a military building in the USA with the shape of a regular pentagon. It is called The Pentagon. This should help you to remember.
Pentagon
A pentagon can have 0, 1 or 2 pairs of parallel lines. It can have 0 to 4 lines perpendicular to an adjacent line. A rhombus must have two pairs of parallel lines and none of them may be perpendicular to any other.