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Diagonal vs. Oblique: Know the Difference

Shumaila Saeed
By Shumaila Saeed || Updated on December 25, 2023
Diagonal refers to a straight line connecting two non-adjacent corners of a shape, while oblique implies a slanted or sloping direction, not perpendicular or parallel.
Diagonal vs. Oblique

Key Differences

Diagonal lines are straight and connect two opposite corners in a geometric shape, creating a sense of direction and division. In contrast, oblique lines or angles are neither parallel nor at a right angle to a reference line, suggesting an indirect or slanted approach.
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Dec 07, 2023
In geometry, a diagonal is a specific type of line segment, whereas oblique often refers to angles or directions that are not orthogonal. Diagonals are precise and measurable, while oblique can signify a more general deviation from the perpendicular or horizontal.
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Diagonal lines in art or design lead the viewer's eye across the composition, offering a sense of movement. Oblique lines, on the other hand, can convey dynamism or instability, breaking the balance with their uneven orientation.
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In language, "diagonal" is used to describe a clear, direct cross-connection, whereas "oblique" often describes indirect or evasive speech, aligning with its physical implication of slant or deviation.
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The use of diagonal in architecture can create dynamic visual effects and structural efficiency, whereas oblique elements in structures might introduce unconventional, visually interesting forms that challenge traditional alignment.
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Comparison Chart

Definition

A straight line connecting two non-adjacent corners of a shape or area.
Slanted or sloping, not perpendicular or parallel.
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Geometry

Exact, measurable line segments in shapes.
Angles that are neither right angles nor perpendicular.
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Artistic Implication

Creates a sense of direction and movement.
Conveys dynamism and instability.
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Linguistic Usage

Describes direct, straightforward connections.
Often used to describe indirectness or evasion.
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Architectural Use

Used for dynamic visual effects and structural efficiency.
Introduces unconventional forms, challenging traditional alignments.
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Diagonal and Oblique Definitions

Diagonal

A diagonal line or plane in three-dimensional figures.
The diagonal of the cube adds an interesting visual element.
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Oblique

In grammar, an oblique case.
In Latin, nouns have several oblique cases.
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Diagonal

In chess or other grid-based games, a movement along a diagonal line.
The bishop moves diagonally across the board.
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Dec 07, 2023

Oblique

Having a slanting or sloping direction, course, or position; inclined.
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Oct 19, 2023

Diagonal

An oblique indication or hint.
His comments provided a diagonal insight into the problem.
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Oblique

(Mathematics) Designating geometric lines or planes that are neither parallel nor perpendicular.
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Oct 19, 2023

Diagonal

A line segment joining two non-adjacent vertices of a polygon.
The square has two diagonals that intersect at the center.
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Oblique

(Botany) Having the part on one side of the midrib of a different size or shape than the part on the other side. Used of a leaf.
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Oct 19, 2023

Diagonal

Joining two nonadjacent vertices of a polygon.
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Oct 19, 2023

Oblique

(Anatomy) Situated in a slanting position; not transverse or longitudinal
Oblique muscles or ligaments.
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Diagonal

Joining two vertices of a polyhedron not in the same face.
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Oct 19, 2023

Oblique

Indirect or evasive
Oblique political maneuvers.
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Oct 19, 2023

Diagonal

Having a slanted or oblique direction.
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Oblique

Devious, misleading, or dishonest
Gave oblique answers to the questions.
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Diagonal

Having oblique lines or markings.
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Oblique

Not direct in descent; collateral.
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Diagonal

Relating to or being the front left and back right feet or the front right and back left feet of a quadruped.
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Oblique

(Grammar) Designating any noun case except the nominative or the vocative.
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Oct 19, 2023

Diagonal

(Mathematics)A diagonal line or plane.
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Oct 19, 2023

Oblique

An oblique thing, such as a line, direction, or muscle.
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Diagonal

Something, such as a row, course, or part, that is arranged obliquely.
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Oblique

At an angle of 45°.
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Diagonal

A fabric woven with diagonal lines.
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Oblique

Not erect or perpendicular; not parallel to, or at right angles from, the base.
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Diagonal

A virgule.
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Oblique

Not straightforward; obscure or confusing.
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Diagonal

(geometry) Joining two nonadjacent vertices (of a polygon or polyhedron).
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Oct 19, 2023

Oblique

Disingenuous; underhand; morally corrupt.
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Oct 19, 2023

Diagonal

Having slanted or oblique lines or markings.
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Oct 19, 2023

Oblique

Not direct in descent; not following the line of father and son; collateral.
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Oct 19, 2023

Diagonal

Having a slanted or oblique direction.
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Oct 19, 2023

Oblique

Having the base of the blade asymmetrical, with one side lower than the other.
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Diagonal

Of or related to the cater-corner (diagonally opposite) legs of a quadruped, whether the front left and back right or front right and back left.
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Oct 19, 2023

Oblique

Growing at an angle that is neither vertical nor horizontal.
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Diagonal

(geometry) A line joining non-adjacent vertices of a polygon.
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Oct 19, 2023

Oblique

(grammar) Pertaining to the oblique case (non-nominative).
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Oct 19, 2023

Diagonal

Anything forming or resembling such a line, particularly:
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Oct 19, 2023

Oblique

Indirect; employing the actual words of the speaker but as related by a third person, having the first person in pronoun and verb converted into the third person and adverbs of present time into the past, etc.
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Oct 19, 2023

Diagonal

(geometry) A line or plane at an oblique angle to another.
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Oct 19, 2023

Oblique

(music) Employing oblique motion, motion or progression in which one part (voice) stays on the same note while another ascends or descends.
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Oct 19, 2023

Diagonal

A line or cut across a fabric at an oblique angle to its sides.
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Oct 19, 2023

Oblique

(geometry) An oblique line.
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Diagonal

Synonym of slash⟨/⟩.
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Oct 19, 2023

Oblique

Synonym of slash⟨/⟩.
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Oct 19, 2023

Diagonal

Joining two not adjacent angles of a quadrilateral or multilateral figure; running across from corner to corner; crossing at an angle with one of the sides.
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Oct 19, 2023

Oblique

(grammar) The oblique case.
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Diagonal

A right line drawn from one angle to another not adjacent, of a figure of four or more sides, and dividing it into two parts.
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Oct 19, 2023

Oblique

(intransitive) To deviate from a perpendicular line; to become askew;
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Diagonal

A member, in a framed structure, running obliquely across a panel.
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Oblique

(military) To march in a direction oblique to the line of the column or platoon; — formerly accomplished by oblique steps, now by direct steps, the men half-facing either to the right or left.
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Diagonal

A diagonal cloth; a kind of cloth having diagonal stripes, ridges, or welts made in the weaving.
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Oblique

To slant (text, etc.) at an angle.
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Diagonal

(geometry) a straight line connecting any two vertices of a polygon that are not adjacent
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Oblique

Not erect or perpendicular; neither parallel to, nor at right angles from, the base; slanting; inclined.
It has a direction oblique to that of the former motion.
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Oct 19, 2023

Diagonal

A line or cut across a fabric that is not at right angles to a side of the fabric
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Oblique

Not straightforward; indirect; obscure;
The love we bear our friends . . . Hath in it certain oblique ends.
This mode of oblique research, when a more direct one is denied, we find to be the only one in our power.
Then would be closed the restless, oblique eye.That looks for evil, like a treacherous spy.
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Diagonal

An oblique line of squares of the same color on a checkerboard;
The bishop moves on the diagonals
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Oblique

Not direct in descent; not following the line of father and son; collateral.
His natural affection in a direct line was strong, in an oblique but weak.
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Diagonal

(mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry
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Oblique

An oblique line.
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Diagonal

A punctuation mark (/) used to separate related items of information
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Oblique

To deviate from a perpendicular line; to move in an oblique direction.
Projecting his person towards it in a line which obliqued from the bottom of his spine.
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Diagonal

At an angle; especially connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face;
A diagonal line across the page
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Oblique

To march in a direction oblique to the line of the column or platoon; - formerly accomplished by oblique steps, now by direct steps, the men half-facing either to the right or left.
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Shumaila Saeed
Oct 19, 2023

Diagonal

Having an oblique or slanted direction
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Oblique

Any grammatical case other than the nominative
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Diagonal

Something arranged or positioned diagonally.
The tiles were laid in a diagonal pattern.
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Dec 07, 2023

Oblique

A diagonally arranged abdominal muscle on either side of the torso
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Oblique

Slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angular;
The oblique rays of the winter sun
Acute and obtuse angles are oblique angles
The axis of an oblique cone is not perpendicular to its base
The axes are perpendicular to each other
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Oblique

Indirect in departing from the accepted or proper way; misleading;
Used devious means to achieve success
Gave oblique answers to direct questions
Oblique political maneuvers
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Oblique

Deviating from a straight line or course, not direct.
The path took an oblique turn through the forest.
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Oblique

Not explicit or done in a direct way.
His remarks were oblique and hard to understand.
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Oblique

Inclined or slanting.
The oblique rays of the sun cast long shadows.
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Oblique

Not perpendicular or parallel.
The oblique angle added a unique aspect to the design.
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Repeatedly Asked Queries

How is oblique different from perpendicular?

Oblique lines are slanted, not at a right angle, unlike perpendicular lines.
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Dec 07, 2023

Are diagonals always straight?

Yes, diagonals are straight lines by definition.
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Dec 07, 2023

What does an oblique angle look like?

An oblique angle is one that is not a right angle; it is slanted.
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Dec 07, 2023

What is a diagonal line?

A straight line connecting two non-adjacent corners of a shape or polygon.
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Dec 07, 2023

What does oblique mean in literature?

It often refers to indirect or evasive speech or writing.
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Can a diagonal be oblique?

Yes, diagonals in shapes are often oblique, not aligning with any reference axis.
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What are oblique muscles?

They are muscles located on the sides of the abdomen, slanting in orientation.
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Can diagonals be equal in length?

In certain shapes like squares, the diagonals are equal.
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Is diagonal used in mathematics?

Yes, particularly in geometry to describe certain line segments in polygons.
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Dec 07, 2023

Do diagonals have to intersect?

They often intersect, especially in symmetrical shapes.
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Can a diagonal divide a shape into symmetrical parts?

Yes, in many shapes, a diagonal can create symmetrical sections.
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Dec 07, 2023

Is diagonal important in art?

Yes, it creates movement and direction in compositions.
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Dec 07, 2023

Is oblique a common term in geometry?

It's less common than terms like perpendicular or parallel, but still used.
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Dec 07, 2023

Can oblique be used to describe behavior?

Yes, it can describe indirect or non-straightforward actions.
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Dec 07, 2023

What is the diagonal of a square?

It's the line segment connecting two opposite corners.
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Dec 07, 2023

Can an oblique line be horizontal?

No, oblique lines deviate from horizontal and vertical lines.
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Dec 07, 2023

Can diagonals be part of architectural design?

Yes, they are often used for structural and aesthetic purposes in architecture.
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Dec 07, 2023

How does diagonal movement work in chess?

Pieces like bishops move along diagonal lines across the board.
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Dec 07, 2023

Are all slanted lines oblique?

Generally, yes, if they are not perpendicular or parallel to reference lines.
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Shumaila Saeed
Dec 07, 2023

Does oblique imply a specific angle?

No, it generally means any angle that is not right, straight, or perpendicular.
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Dec 07, 2023

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Shumaila Saeed
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Shumaila Saeed
Shumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.

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