  # Rhombus vs. Parallelogram: What's the Difference? Reviewed by Sawaira Riaz || By Sumera Saeed || Updated on October 12, 2023
Rhombus is a quadrilateral with all sides equal and opposite angles equal. Parallelogram is a quadrilateral with opposite sides parallel and equal. ## Key Differences

A rhombus stands out in the family of quadrilaterals as it is characterized by having all four of its sides of equal length. In contrast, a parallelogram is a quadrilateral where opposite sides are parallel and equal in length, without a necessity for all sides to be equal. This characteristic difference highlights that while every rhombus is a parallelogram (due to its opposite equal and parallel sides), not every parallelogram is a rhombus, clearly distinguishing their defining features.
While considering angles, a rhombus doesn’t always guarantee right angles, but it assures that opposite angles are equal. On the other side, a parallelogram ensures that adjacent angles are supplementary (adding up to 180 degrees) and opposite angles are equal, providing a geometrical distinction between the two in terms of their interior angular properties, showing that a parallelogram might sometimes encompass right angles, becoming a rectangle.
In terms of diagonals, a rhombus possesses diagonals that are always perpendicular bisectors of each other and are not necessarily equal. However, a parallelogram shows a different behavior in which its diagonals bisect each other but are not necessarily perpendicular or equal, reflecting a clear differential aspect between the two quadrilaterals.
Diving into symmetry, a rhombus always showcases rotational symmetry of order two, implying it appears identical after a rotation of 180 degrees. Contrarily, a parallelogram demonstrates line symmetry (or reflection symmetry) but does not guarantee rotational symmetry, giving an extra layer to their contrasting natures.
Focusing on area calculations, both the rhombus and parallelogram utilize base and height in their formulas. Specifically, a rhombus multiplies its diagonals and then divides by two, while a parallelogram multiplies its base by its height. This distinction in formula application is pivotal for students and professionals in using these shapes effectively in geometrical computations and real-world applications.

## Comparison Chart

### Definition

All sides are equal.
Opposite sides are equal and parallel.

### Angles

Opposite angles are equal.
Opposite angles are equal.

### Diagonals

Perpendicular bisectors and not necessarily equal.
Bisect each other, not necessarily perpendicular.

### Symmetry

Has rotational symmetry of order two.
Has at least one line of symmetry.

### Area Calculation Formula

(Diagonal1 × Diagonal2) / 2
Base × Height

## Rhombus and Parallelogram Definitions

#### Rhombus

In a rhombus, opposite angles are equal, providing symmetry.
The rhombus displayed equal angles opposite to each other.

#### Parallelogram

A parallelogram has its opposite sides parallel and equal.
The parallelogram showed equal and parallel opposite sides.

#### Rhombus

The diagonals of a rhombus bisect each other at right angles.
The diagonals of the rhombus intersected perpendicularly.

#### Parallelogram

In a parallelogram, opposite angles are always equal.
The parallelogram exhibited equal angles across from each other.

#### Rhombus

A rhombus has a rotational symmetry of order two.
Rotating the rhombus 180 degrees yielded the same shape.

#### Parallelogram

The diagonals of a parallelogram bisect each other.
Diagonals of the parallelogram intersected, dividing each other in half.

#### Rhombus

The area of a rhombus is half the product of its diagonals.
Calculating area of the rhombus used the diagonal lengths.

#### Parallelogram

A parallelogram has at least one line of symmetry.
This parallelogram exhibited symmetry along its longer diagonal.

#### Rhombus

A rhombus is a four-sided figure with all sides of equal length.
The diamond shape in playing cards is a rhombus.

#### Parallelogram

The area of a parallelogram is obtained by multiplying its base and height.
We used the base and height to find the area of the parallelogram.

#### Rhombus

An equilateral parallelogram, especially one having oblique angles. Also called rhomb.

#### Parallelogram

A four-sided plane figure with opposite sides parallel.

#### Rhombus

(geometry) A parallelogram having all sides of equal length.

#### Parallelogram

(geometry) A convex quadrilateral in which each pair of opposite edges are parallel and of equal length.

#### Parallelogram

Either of two rectangular areas (respectively the large parallelogram and the small parallelogram) abutting the goal line in front of the goal. (Since 1986 officially named the large rectangle and small rectangle, though the older names are still occasionally used.)

#### Parallelogram

A right-lined quadrilateral figure, whose opposite sides are parallel, and consequently equal; - sometimes restricted in popular usage to a rectangle, or quadrilateral figure which is longer than it is broad, and with right angles.

#### Parallelogram

A quadrilateral whose opposite sides are both parallel and equal in length

## FAQs

#### How do the diagonals of a parallelogram behave?

The diagonals of a parallelogram bisect each other but are not necessarily perpendicular or equal.

#### What defines a parallelogram?

A parallelogram is a quadrilateral where opposite sides are equal and parallel.

#### Is a square a special case of a parallelogram?

Yes, a square is a special type of parallelogram where all sides and angles are equal.

#### Do all rhombi have congruent diagonals?

No, a rhombus may have non-congruent diagonals that are perpendicular bisectors.

#### How is the area of a parallelogram determined?

The area of a parallelogram is found by multiplying its base and height: A = base * height.

#### Can a parallelogram be a rhombus?

A parallelogram can be a rhombus if all its sides are of equal length.

#### Do all parallelograms have congruent diagonals?

No, parallelograms do not necessarily have congruent diagonals.

#### How do angles behave in a rhombus?

In a rhombus, opposite angles are equal, and adjacent angles are supplementary.

#### How do angles behave in a parallelogram?

In a parallelogram, opposite angles are equal, and adjacent angles are supplementary.

#### How do the diagonals of a rhombus behave?

The diagonals of a rhombus are perpendicular bisectors of each other and may be unequal.

#### What is the perimeter of a rhombus?

The perimeter of a rhombus is four times the length of one side (P = 4s).

#### What is a rhombus?

A rhombus is a quadrilateral with all sides equal in length and opposite angles equal.

#### How can we calculate the area of a rhombus?

The area of a rhombus is calculated as half the product of its diagonals: (d1 * d2) / 2.

#### Can a rhombus be a parallelogram?

Yes, since a rhombus has opposite sides parallel and equal, it is a type of parallelogram.

#### What type of symmetry does a parallelogram have?

A parallelogram has at least one line of symmetry.

#### Is a square a special case of a rhombus?

Yes, a square is a special case of a rhombus where all angles are right angles.

#### What type of symmetry does a rhombus have?

A rhombus has rotational symmetry of order two.  