A rhombus is a quadrilateral by definition.
A quadrilateral is a polygon with 4 sides.
A rhombus is a quadrilateral where all 4 sides have equal lengths. All rhombuses are also parallelograms. If a rhombus has right angles, the it is also a square.
Meaning that a square is a special type of rhombus.
A rhombus is a special type of parallelogram.
A parallelogram is a special type of quadrilateral.
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The internal angles of a quadrilateral add up to 360 degrees.
360 - (90 + 100 + 120)...
A rhombus may be a square or just a rhombus (a rhombus is merely called a rhombus when there are no 90 degree angles).
Rhombus Not a SquareIn a square, the sides are perpendicular. In a rhombus, they aren't. A rhombus is never a square.