Skip to main content

Parallelogram 

Share definition Flag
In Euclidean geometry, a parallelogram is a simple (non self-intersecting) quadrilateral with two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure. The congruence of opposite sides and opposite angles is a direct consequence of the Euclidean Parallel Postulate and neither condition can be proven without appealing to the Euclidean Parallel Postulate or one of its equivalent formulations. The three-dimensional counterpart of a parallelogram is a parallelepiped.

The etymology (in Greek παραλληλ-όγραμμον, a shape "of parallel lines") reflects the definition.

A simple (non self-intersecting) quadrilateral is a parallelogram if and only if any one of the following statements is true:12

Two pairs of opposite sides are equal in length.

Two pairs of opposite angles are equal in measure.

The diagonals bisect each other.

One pair of opposite sides are parallel and equal in length.

Adjacent angles are supplementary.

Each diagonal divides the quadrilateral into two congruent triangles.

The sum of the squares of the sides equals the sum of the squares of the diagonals. (This is the parallelogram law.)

It has rotational symmetry of order 2.
What are you studying Jane?
Oh, I am studying quadrilaterals, specifically I am on Chapter 5 proving a quadrilateral is a Parallelogram, Claire.
Parallelogram by david faustino December 18, 2012
Related Words

parallel partying 

Share definition Flag
When Drinkers and Stoners party together.
I don't need a drink, I just smoked a joint, I'm parallel partying with you guys.
parallel partying by 6deluca6 August 30, 2016

Paolito 

Share definition Flag
A man that is so good at doing backrounds
Wow hes such a paolito
Paolito by zereph February 23, 2023

PaoLUL 

Share definition Flag
a legit, pinoy YouTuber, that shows videos with demonitization, meme reviews, and reactions based on other YouTubers and other videos in the web.
Victor: I want some quality content. Where can you find it?
Tito Travis: Try searching PaoLUL in YouTube! That's where you can find it!
PaoLUL by Saburo-kun June 19, 2019

Parallel killer 

Share definition Flag
Someone who kills many people at once
Dave realized that being a parallel killer was much more efficient than being a serial killer.
Parallel killer by Low Bo February 14, 2015

Celebration Parallax 

Share definition Flag
The phenomenon whereby the exact same set of facts is either celebrated or deplored depending solely on the political bias of the observer.
When a liberal writes that increased immigration is good because it leads to a liberal demographic shift, but then writes that conservatives decrying increased immigration are pushing "replacement theory," that's celebration parallax.
Celebration Parallax by sensei10 January 31, 2023
More from Urban Dictionary

Overstand 

Share definition Flag
To understand a topic or statement to the highest extent.
Leroy, after being told the tenth time by his sister, did overstand her idea of robbing the 7-11.
Overstand by Elf Eater March 23, 2003
Word of the Day on August 20, 2026

minimap 

Share definition Flag
A map that mostly tells you where everything is
Friend 1: Follow me there is a player nearby
Friend 2: How do you know?
Friend 1: Minimap
minimap by LeWord January 13, 2015
Word of the Day on August 19, 2026

Pink Cloud

Share definition Flag
12 step recovery jargon referring to someone new who talks about how great life is, now that they're sober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.
Pink Cloud by toniwithaneye November 24, 2006
Word of the Day on August 18, 2026

Dotard 

Share definition Flag
An aging individual who has long lost the ability to make rational sense.
That dotard is going to get us all blown up, if he doesn't calm down .
Dotard by anonymous September 22, 2017
Word of the Day on August 17, 2026

Chancla

Share definition Flag
The deadliest weapon known to a Latin kid; a flying slipper/ flip-flop.
My mom hit me with a chancla.
Chancla by TardisBae October 31, 2014
Word of the Day on August 16, 2026

Striver 

Share definition Flag
The striver is an interesting phenomenon that is seen across college campuses. In essence, the striver is an over-achiever who comes from a working or middle class family. He may be an immigrant. He may have been a slacker in HS who was "born again" into an academic wunderkind. Or he may just be an over-achiever who is keeping at it.

The striver is willing to sacrifice his social life at the expense of Phi Beta Kappa and Summa Cum Laude. The striver is the guy who stays at the library long after you are gone. The striver is the guy who takes 30 credits/semester and considers anything below an A/4.0 failure. The striver doesn't work on campus, he is too busy finding ways to pad his resume instead of working retail or workstudy. The striver lets his grades pay his education by applying to ten scholarships a year.

The striver is a future Soros/Fullbright/Rhodes/Gates/Marshall/etc. fellow. The striver lives to study. For the striver, their fun comes from the rewards they expect to receive in return for their diligence. Be it Law School, B-School, academia, or politics. The striver seeks to find the American Dream through academic success.
Anthony was a striver. He transfered from a TTT to an IVY and graduated in 2 years. He studied his ass off and went to Penn Law. He got a Biglaw offer. But lost it all because of an unmoderated mesasgeboard.

Successful strivers:
- Barack Obama
- Harold Koh
Striver by URM Striver January 3, 2009
Word of the Day on August 15, 2026
Next