Yes. A parallelogram has two pairs of equal sides, but in a rhombus all the sides are equal.(similar situation: a square is a special kind of rectangle)
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A parallelogram is a quadrilateral, which has 2 pair of parallel sides. Squares, rhombuses and rectangles are special cases of parallelograms.
Yes. All rhombuses are parallelograms, but the reverse is not true. (I.e. there are parallelograms which are rhombuses and there a parallelograms that are not rhombuses. -- Just like Every bus has wheels but not everything with wheels is a bus.)
Because they have four sides that comprise two pairs of parallel sides.
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.
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.