Circumference

So what is the circumference?

It's 27 kilometers in circumference.

So what's the circumference of this?

Times the circumference of the Earth!

So we know the formula for the circumference of the circle. Circumference is equal to pi times d. Right?

What is the circumference of the circle?

You've calculated the circumference of the earth.

And I were to tell you that its circumference is equal to 10 meters that's the circumference of the circle.

The circumference of this circle right over here which is the same thing as the circumference of that circle over there.

It sits, its vertex sits on the circumference.

The ratio of the circumference to the diameter.

Circumference is equal to pi times the diameter.

So the circumference is equal to 22 pi.

It's 109 the circumference of the Earth 109 40 hours that's what it would take you to do a circumference of the Earth.

We call that word the circumference of the circle.

Maybe the ratio of the circumference of the diameter's 3.

So maybe the circumference is always three times the diameter.

The circumference is equal to 2 times pi times the radius.

Then 2 inches along its circumference will be touching the ground.

So the circumference is going to be 25,000 and 6.28 meters.

If you've got the radius and you want to calculate the circumference multiply both sides of this definition by two times the radius and you get two times the radius times pi is equal to the circumference or more familiarly it would be circumference is equal to two pi r.

So the circumference over here is going to be 2 pi r meters

We're now talking about this, the earlier Eratosthenes technique of measuring the circumference.

With these figures, Al Ma'mun's astronomers were able to estimate the Earth's circumference.

(the Earth) the Sun has, the Sun is 109 circumference of the Earth!

The surface of a hexagon... in relation to the radius of the circumference?

So just to give a sense of scale here, the earth's circumference, if you were to go around the planet, the earth's circumference, just like that, is about 40 000km 40 000km...

If you know the circumference of a circle, and you have two points on it, all you need to know is the distance between those two points, and you can extrapolate the circumference.

And once again, the ratio of the circumference of the diameter was roughly 3.

Maybe the ratio of the circumference to the diameters always fixed for any circle.

So if you think about it, it's going to cover its circumference 8 times.

Now, if you know the circumference obwód of a circle, and you have two points on it, all you need to know is the distance between those two points, and you can extrapolate the circumference.

Well, we're gonna travel a whole circumference per revolution, so 2 pi r meters per revolution

Now, what I just did was I worked with the mathematics the diameter and the circumference.

Well, now I'm going to ask a question. What should the circumference of that rim be?

The entire journey covered over 24,000 miles, the same distance as the circumference of the Earth.

literally I'm just saying if you divide the circumference by the diameter, you're going to get pi.

So the circumference is 6 pi meters, the diameter is 6 meters, the radius is 3 meters.

Feed your head, feed your head, feed your head.

Feed your head, feed your head, feed your head. (Music)

Your circumference is defined by all of the points that are exactly a radius away from the center.

His numerous legs, pitifully thin in comparison to the rest of his circumference, flickered helplessly before his eyes.

A head? Yeah, head meat.

The ratio of the circumference of the diameter was this kind of magical number, they gave it a name.