Pentagon
noun
A shape with five sides and five angles.
The stop sign is shaped like a pentagon.
Often appears as...
- regular pentagon
- irregular pentagon
noun
A building in the United States where the military leaders work.
The Pentagon announced a new military initiative today.
Often appears as...
- the pentagon officials
- the pentagon spokesman
noun
A shape with five sides and five angles.
The stop sign is shaped like a pentagon.
Often appears as...
- regular pentagon
- irregular pentagon
noun
A building in the United States where the military leaders work.
The Pentagon announced a new military initiative today.
Often appears as...
- the pentagon officials
- the pentagon spokesman
Definition 1 of 2
Pro Tip 1/3Five Equal Sides
In a regular pentagon, all sides and angles are equal. This is not true for irregular pentagons.
A regular pentagon has five sides of the same length.
Pro Tip 2/3Shape Attributes
The term 'pentagon' refers only to the number of sides and angles, not their lengths or angles' sizes.
A drawing of a house often includes an irregular pentagon to represent a door.
Pro Tip 3/3Math Usage
In math contexts, 'pentagon' often implies a regular pentagon unless specified otherwise.
To calculate the area, remember that this is a regular pentagon.
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Video examples
Waiting for a Second...
assume you're taking our picture I do not have a monitor but right now we just had a middle section here of the e-ring of the pentagon collapse from the amount of fire and destruction from this so obviously there was a great deal of damage here it just collapsed we don't know who is inside or how many people were inside you've heard somebody one of the people who was inside the building talked to us a short time ago and said
Video examples
Exploring other...
to equilateral triangles to squares, pentagons, hexagons, all the way up to circles. These shapes are all scurrying around a flat world, living their flat lives. They have a single eye on the front of their faces, and let's see what the world looks like from their perspective. What they see is essentially one dimension,
Video examples
Turning trash into toys...
It's a joint of tubes. You start by teaching angles -- an acute angle, a right angle, an obtuse angle, a straight angle. It's like its own little coupling. If you have three of them, and you loop them together, well you make a triangle. With four, you make a square, you make a pentagon, you make a hexagon,
Video examples
Why do honeybees love...
One suggested triangles, "We can use triangles. Look! They fit together perfectly." Another bee suggested squares. Finally, a third bee piped up and said, "Pentagons don't seem to work, but hexagons do! We want the one that will use the least amount of wax and be able to store the most amount of honey.
Video examples
Luca Turin: The science...
crystalline compound. Let us try it. And I said, first of all, let me do the calculation on that compound, bottom right, which is related to coumarin, but has an extra pentagon inserted into the molecule. Calculate the vibrations, the purple spectrum is that new fellow, the white one is the old one.
Video examples
Michael Pawlyn: Using...
So for instance, it was soap bubbles that helped us generate a building form that would work regardless of the final ground levels. Studying pollen grains and radiolaria and carbon molecules helped us devise the most efficient structural solution using hexagons and pentagons.
Video examples
Hire the hackers! -...
States for hacking into the to the Pentagon suffers from acts per Asperger's and the secondary condition of depression and Baron Cohen explained that certain disabilities can manifest themselves in the hacking and computing world as tremendous skills and that we
Video examples
Uncovering Jupiter's...
What we find is vortices, kind of like hurricanes, they're all packed together, and we've been watching them now for a year and they haven't all merged into one. They're packed in in this pentagonal pattern. There's actually six of them
Video examples
The complex geometry of...
because pentagons don't neatly fill a surface, so instead of just creating a pattern in a pentagon, other shapes have to be added to make something that is repeatable, resulting in patterns that may seem confoundingly complex,
Video examples
Can you solve the...
Importantly, it also works for some polygons with fewer sides, including heptagons, hexagons, and pentagons. That’s good news, because if you cut off the sharp corners of the blob triangle,
Video examples
Waiting for a Second...
assume you're taking our picture I do not have a monitor but right now we just had a middle section here of the e-ring of the pentagon collapse from the amount of fire and destruction from this so obviously there was a great deal of damage here it just collapsed we don't know who is inside or how many people were inside you've heard somebody one of the people who was inside the building talked to us a short time ago and said
Video examples
Exploring other...
to equilateral triangles to squares, pentagons, hexagons, all the way up to circles. These shapes are all scurrying around a flat world, living their flat lives. They have a single eye on the front of their faces, and let's see what the world looks like from their perspective. What they see is essentially one dimension,
Video examples
Turning trash into toys...
It's a joint of tubes. You start by teaching angles -- an acute angle, a right angle, an obtuse angle, a straight angle. It's like its own little coupling. If you have three of them, and you loop them together, well you make a triangle. With four, you make a square, you make a pentagon, you make a hexagon,
Video examples
Why do honeybees love...
One suggested triangles, "We can use triangles. Look! They fit together perfectly." Another bee suggested squares. Finally, a third bee piped up and said, "Pentagons don't seem to work, but hexagons do! We want the one that will use the least amount of wax and be able to store the most amount of honey.
Video examples
Luca Turin: The science...
crystalline compound. Let us try it. And I said, first of all, let me do the calculation on that compound, bottom right, which is related to coumarin, but has an extra pentagon inserted into the molecule. Calculate the vibrations, the purple spectrum is that new fellow, the white one is the old one.
Video examples
Michael Pawlyn: Using...
So for instance, it was soap bubbles that helped us generate a building form that would work regardless of the final ground levels. Studying pollen grains and radiolaria and carbon molecules helped us devise the most efficient structural solution using hexagons and pentagons.
Video examples
Hire the hackers! -...
States for hacking into the to the Pentagon suffers from acts per Asperger's and the secondary condition of depression and Baron Cohen explained that certain disabilities can manifest themselves in the hacking and computing world as tremendous skills and that we
Video examples
Uncovering Jupiter's...
What we find is vortices, kind of like hurricanes, they're all packed together, and we've been watching them now for a year and they haven't all merged into one. They're packed in in this pentagonal pattern. There's actually six of them
Video examples
The complex geometry of...
because pentagons don't neatly fill a surface, so instead of just creating a pattern in a pentagon, other shapes have to be added to make something that is repeatable, resulting in patterns that may seem confoundingly complex,
Video examples
Can you solve the...
Importantly, it also works for some polygons with fewer sides, including heptagons, hexagons, and pentagons. That’s good news, because if you cut off the sharp corners of the blob triangle,
Example 1 of 10
Quote examples
Thomas P.M. Barnett
American Businessman
Here's my favorite bonehead concept from the 1990s in the Pentagon: the theory of anti-access, area-denial asymmetrical strategies. Why do we call it that? Because it's got all those A's lined up I guess. This is gobbledygook for 'If the United States fights somebody, we're going to be huge. They're going to be small.
Quote examples
Kenny Omega
Canadian Athlete
Pentagon not only has the untrainable 'It' factor but also the rare ability to adapt and succeed wherever he competes. He has a unique charisma about him that fans connect with, and regardless of where he competes or what style is prominent, he seamlessly blends in - yet stands apart from everyone else on the card.
Quote examples
Marilyn Minter
American Artist
I was there when they shut down the Pentagon; I've been going on protest marches my whole life... And now, this fight against controlling and policing women's bodies feels like a war.
Quote examples
Jeff Sessions
American Politician
Bin Laden, who was in his country, attacked and damaged our Pentagon, and killed our soldiers right out here at the Pentagon. But his pentagon no longer exists. It is rubble.
Quote examples
Rachel Maddow
American Journalist
Pentagon dollars are essentially seen as a different kind of funding that doesn't have to stand for itself and make an argument for itself in the house of Congress.
Quote examples
Tom Noddy
American Entertainer
On good days, I've done bubbles with as many as 38 faces - a row of pentagons, a row of hexagons, and another row of pentagons on bottom.
Quote examples
Dan Shechtman
Israeli Scientist
I told everyone who was ready to listen that I had material with pentagonal symmetry. People just laughed at me.
Quote examples
Thomas P.M. Barnett
American Businessman
Here's my favorite bonehead concept from the 1990s in the Pentagon: the theory of anti-access, area-denial asymmetrical strategies. Why do we call it that? Because it's got all those A's lined up I guess. This is gobbledygook for 'If the United States fights somebody, we're going to be huge. They're going to be small.
Quote examples
Kenny Omega
Canadian Athlete
Pentagon not only has the untrainable 'It' factor but also the rare ability to adapt and succeed wherever he competes. He has a unique charisma about him that fans connect with, and regardless of where he competes or what style is prominent, he seamlessly blends in - yet stands apart from everyone else on the card.
Quote examples
Marilyn Minter
American Artist
I was there when they shut down the Pentagon; I've been going on protest marches my whole life... And now, this fight against controlling and policing women's bodies feels like a war.
Quote examples
Jeff Sessions
American Politician
Bin Laden, who was in his country, attacked and damaged our Pentagon, and killed our soldiers right out here at the Pentagon. But his pentagon no longer exists. It is rubble.
Quote examples
Rachel Maddow
American Journalist
Pentagon dollars are essentially seen as a different kind of funding that doesn't have to stand for itself and make an argument for itself in the house of Congress.
Quote examples
Tom Noddy
American Entertainer
On good days, I've done bubbles with as many as 38 faces - a row of pentagons, a row of hexagons, and another row of pentagons on bottom.
Quote examples
Dan Shechtman
Israeli Scientist
I told everyone who was ready to listen that I had material with pentagonal symmetry. People just laughed at me.
Example 1 of 7
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