Radius
noun
The straight line from the center to the edge of a circle or a ball.
She drew a circle with a radius of 3 centimeters.
Often appears as...
- circle's radius
- sphere radius
Usage tips
Technical
noun
A specific area or distance from a central point.
The restaurant delivers within a 5-mile radius.
Often appears as...
- within a radius
- delivery radius
noun
The bone in the forearm nearest to the thumb.
He fractured his radius during the fall.
Often appears as...
- fractured radius
- radius bone
Usage tips
Medical
noun
A range of action or influence.
Our radio signals have a radius of 50 miles
Often appears as...
- signal radius
- influence radius
Usage tips
Technical
noun
The straight line from the center to the edge of a circle or a ball.
She drew a circle with a radius of 3 centimeters.
Often appears as...
- circle's radius
- sphere radius
Usage tips
Technical
noun
A specific area or distance from a central point.
The restaurant delivers within a 5-mile radius.
Often appears as...
- within a radius
- delivery radius
noun
The bone in the forearm nearest to the thumb.
He fractured his radius during the fall.
Often appears as...
- fractured radius
- radius bone
Usage tips
Medical
noun
A range of action or influence.
Our radio signals have a radius of 50 miles
Often appears as...
- signal radius
- influence radius
Usage tips
Technical
Definition 1 of 4
Pro Tip 1/3Circle Basics
A radius is essential in geometry for calculating area and circumference of a circle.
Find the area of a circle by using the radius in the formula Area = πr^2.
Pro Tip 2/3Measure Twice
Always double-check the length of a radius, as even a small error changes the circle size significantly.
She carefully measured the radius again before cutting the round cake board.
Pro Tip 3/3Not a Diameter
Do not confuse radius with diameter; the radius is half the length of the diameter.
The diameter is twice the radius, so if the radius is 4 cm, the diameter will be 8 cm.
Pro Tip 1/3Circle Basics
A radius is essential in geometry for calculating area and circumference of a circle.
Find the area of a circle by using the radius in the formula Area = πr^2.
Pro Tip 2/3Measure Twice
Always double-check the length of a radius, as even a small error changes the circle size significantly.
She carefully measured the radius again before cutting the round cake board.
Pro Tip 3/3Not a Diameter
Do not confuse radius with diameter; the radius is half the length of the diameter.
The diameter is twice the radius, so if the radius is 4 cm, the diameter will be 8 cm.
Pro Tip 1/3Circle Basics
A radius is essential in geometry for calculating area and circumference of a circle.
Find the area of a circle by using the radius in the formula Area = πr^2.
Pro Tip 2/3Measure Twice
Always double-check the length of a radius, as even a small error changes the circle size significantly.
She carefully measured the radius again before cutting the round cake board.
Pro Tip 3/3Not a Diameter
Do not confuse radius with diameter; the radius is half the length of the diameter.
The diameter is twice the radius, so if the radius is 4 cm, the diameter will be 8 cm.
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Video examples
How we're using drones...
It's actually going to be the largest autonomous system anywhere in the world. To give you a sense of what this looks like, this is one of the first distribution centers. You can see a 75-kilometer service radius around the distribution center, and that allows us to serve hundreds of health facilities and hospitals, all of which are rural, from that single distribution center.
Video examples
Da Vinci's Vitruvian Man...
I take the value for pi and multiply it by the radius squared. I also know how to take the area of a square. I multiply the base by itself. But how can I take the area of a circle and create a square with an equal area? This is a problem often called "squaring a circle" that was first proposed in the ancient world. And like many ideas of the ancient world,
Video examples
Andrea Ghez: The hunt...
why it was such an important radius. This is a virtual radius, not reality; the black hole has no size. So why is it so important? It's important because it tells us that any object can become a black hole. That means you, your neighbor, your cellphone, the auditorium can become a black hole
Video examples
Can you survive nuclear...
and a shockwave damaging buildings several kilometers away. There is tragically nothing that can be done to save those in the fireball’s radius. However, for those in the shockwave and beyond, our scientifically supported protocol could be life saving. And though it may sound surprising,
Video examples
Part Ape, Part Human:...
kind ever found in the entirety of the early hominid record the radius the ulna and the humerus that is a human a pygmy of approximately the same size you can see how odd those arms are and when we saw that we said it must be a climber and we predicted what the hand would
Video examples
Why sleep matters now...
interesting in that study is that when they stopped using the iPad before bed there was almost a blast radius effect where their sleep was still disrupted for a couple of nights after it took sort of a wild has almost wash out the effect of that iPad use but as I said
Video examples
Making the impossible...
doctor within a 1,500 mile radius and he literally does everything from deliver babies to appendectomies if it's medical he's the only guy who can do it and so I'm learning about this guy and later on in the article it says you know the one
Video examples
3 kinds of bias that...
of understanding of science. And when we expand our radius, it's not about making a better future, but it's about preserving life as we know it. So as we think about expanding our own radius in understanding science,
Video examples
How we can design...
Those have such a wide turning radius, that we have to deploy an enormous amount of pavement, of asphalt, to accommodate them. Or take the critically important wheelchair.
Video examples
TV Presenter Eats...
belongs they are free and happy what about the pigs and cows they stay inside all day life there is no room to her moving radius here the forest where it belongs
Video examples
How we're using drones...
It's actually going to be the largest autonomous system anywhere in the world. To give you a sense of what this looks like, this is one of the first distribution centers. You can see a 75-kilometer service radius around the distribution center, and that allows us to serve hundreds of health facilities and hospitals, all of which are rural, from that single distribution center.
Video examples
Da Vinci's Vitruvian Man...
I take the value for pi and multiply it by the radius squared. I also know how to take the area of a square. I multiply the base by itself. But how can I take the area of a circle and create a square with an equal area? This is a problem often called "squaring a circle" that was first proposed in the ancient world. And like many ideas of the ancient world,
Video examples
Andrea Ghez: The hunt...
why it was such an important radius. This is a virtual radius, not reality; the black hole has no size. So why is it so important? It's important because it tells us that any object can become a black hole. That means you, your neighbor, your cellphone, the auditorium can become a black hole
Video examples
Can you survive nuclear...
and a shockwave damaging buildings several kilometers away. There is tragically nothing that can be done to save those in the fireball’s radius. However, for those in the shockwave and beyond, our scientifically supported protocol could be life saving. And though it may sound surprising,
Video examples
Part Ape, Part Human:...
kind ever found in the entirety of the early hominid record the radius the ulna and the humerus that is a human a pygmy of approximately the same size you can see how odd those arms are and when we saw that we said it must be a climber and we predicted what the hand would
Video examples
Why sleep matters now...
interesting in that study is that when they stopped using the iPad before bed there was almost a blast radius effect where their sleep was still disrupted for a couple of nights after it took sort of a wild has almost wash out the effect of that iPad use but as I said
Video examples
Making the impossible...
doctor within a 1,500 mile radius and he literally does everything from deliver babies to appendectomies if it's medical he's the only guy who can do it and so I'm learning about this guy and later on in the article it says you know the one
Video examples
3 kinds of bias that...
of understanding of science. And when we expand our radius, it's not about making a better future, but it's about preserving life as we know it. So as we think about expanding our own radius in understanding science,
Video examples
How we can design...
Those have such a wide turning radius, that we have to deploy an enormous amount of pavement, of asphalt, to accommodate them. Or take the critically important wheelchair.
Video examples
TV Presenter Eats...
belongs they are free and happy what about the pigs and cows they stay inside all day life there is no room to her moving radius here the forest where it belongs
Example 1 of 10
Quote examples
Jeff Nichols
American Director
Most film productions, when they're based at a place, they get, like, a 30-mile radius or a 30-minute radius to get out of the town. And once you go past that, your day starts to become shorter, and you have to start paying your drivers more, and everybody just gets paid more, and you have less time to shoot, and everything costs more.
Quote examples
C. S. Lewis
British Writer
We are not living in a world where all roads are radii of a circle and where all, if followed long enough, will therefore draw gradually nearer and finally meet at the centre: rather in a world where every road, after a few miles, forks into two, and each of those into two again, and at each fork, you must make a decision.
Quote examples
Henry David Thoreau
American Author
So thoroughly and sincerely are we compelled to live, reverencing our life, and denying the possibility of change. This is the only way, we say; but there are as many ways as there can be drawn radii from one centre. All change is a miracle to contemplate; but it is a miracle which is taking place every instant.
Quote examples
Laurie Metcalf
American Actress
I had accidentally gotten a laugh on a line in a play I was in during high school. I got hooked, but I had no idea I would ever be able to support myself by acting. I knew no one in the business. I was from the Midwest. No one within a radius of a thousand miles was doing anything like that.
Quote examples
Jaquelin T. Robertson
American Architect
I spent a lot of time on farms when I was growing up, and I've been obsessed with the practical logic of farmyards - the turning radius of tractors, where the chickens and ducks might go. It's not a place where stand-alone aesthetic decisions make a lot of sense.
Quote examples
Greg Lynn
American Architect
Without a computer, every point on a structure has to be calculated with reference to everything else. But by using a PC, I can create complex curves that don't have radii or centers.
Quote examples
Doug Liman
American Director
When I'm working on a film, I think about how it will play with a tiny audience of friends whose opinions I respect - basically, a 40-bloc radius from my apartment in Manhattan.
Quote examples
Richard P. Feynman
American Physicist
The universe is very large, and its boundaries are not known very well, but it is still possible to define some kind of a radius to be associated with it.
Quote examples
Sheck Wes
American Musician
When you live in the projects, everything you need is in a mile radius: a basketball court, an indoor gym, a school, a grocery store, a shopping center.
Quote examples
David Berman
American Musician
If they told me I couldn't leave the radius of six miles from my house, I really wouldn't care. There's nowhere I really want to go.
Quote examples
Jeff Nichols
American Director
Most film productions, when they're based at a place, they get, like, a 30-mile radius or a 30-minute radius to get out of the town. And once you go past that, your day starts to become shorter, and you have to start paying your drivers more, and everybody just gets paid more, and you have less time to shoot, and everything costs more.
Quote examples
C. S. Lewis
British Writer
We are not living in a world where all roads are radii of a circle and where all, if followed long enough, will therefore draw gradually nearer and finally meet at the centre: rather in a world where every road, after a few miles, forks into two, and each of those into two again, and at each fork, you must make a decision.
Quote examples
Henry David Thoreau
American Author
So thoroughly and sincerely are we compelled to live, reverencing our life, and denying the possibility of change. This is the only way, we say; but there are as many ways as there can be drawn radii from one centre. All change is a miracle to contemplate; but it is a miracle which is taking place every instant.
Quote examples
Laurie Metcalf
American Actress
I had accidentally gotten a laugh on a line in a play I was in during high school. I got hooked, but I had no idea I would ever be able to support myself by acting. I knew no one in the business. I was from the Midwest. No one within a radius of a thousand miles was doing anything like that.
Quote examples
Jaquelin T. Robertson
American Architect
I spent a lot of time on farms when I was growing up, and I've been obsessed with the practical logic of farmyards - the turning radius of tractors, where the chickens and ducks might go. It's not a place where stand-alone aesthetic decisions make a lot of sense.
Quote examples
Greg Lynn
American Architect
Without a computer, every point on a structure has to be calculated with reference to everything else. But by using a PC, I can create complex curves that don't have radii or centers.
Quote examples
Doug Liman
American Director
When I'm working on a film, I think about how it will play with a tiny audience of friends whose opinions I respect - basically, a 40-bloc radius from my apartment in Manhattan.
Quote examples
Richard P. Feynman
American Physicist
The universe is very large, and its boundaries are not known very well, but it is still possible to define some kind of a radius to be associated with it.
Quote examples
Sheck Wes
American Musician
When you live in the projects, everything you need is in a mile radius: a basketball court, an indoor gym, a school, a grocery store, a shopping center.
Quote examples
David Berman
American Musician
If they told me I couldn't leave the radius of six miles from my house, I really wouldn't care. There's nowhere I really want to go.
Example 1 of 10
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