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It has 4 equal sides Its perimeter is the sum of its 4 sides
No. A quadrilateral is a polygon with four sides - of any length. A rhombus has four equal sides, a square has four equal sides AND four right angles. Incidentally, four equal sides for a rhombus implies two pairs of parallel sides and equal opposite angles, so those facts are not required to define a rhombus.
A rhombus may be a square or just a rhombus (a rhombus is merely called a rhombus when there are no 90 degree angles).
A rhombus is a type of parallelogram, and what distinguishes its shape is that all four of its sides are congruent. There are several formulas for the rhombus that have to do with itsSides(click for more detail) all 4 sides are congruentAngles(click for more detail) diagonals bisect vertex anglesDiagonals(click for more detail) diagonals are pependicularArea(click for more detail)A square is a rhombus and a rectangle. In other words, if each angle of a rhombus is 90°, then it's a square.
Rhombus Not a SquareIn a square, the sides are perpendicular. In a rhombus, they aren't. A rhombus is never a square.