Name: 【TED-Ed】The infinite life of pi - Reynaldo Lopes
Uploaded: 2014-07-12T06:42:00.000Z
Duration: 3 min 45 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

you'd need measuring tape or a piece of string,

that a circle's circumference would get smaller or larger

but the relationship goes further than that.

the circumference divided by the diameter,

no matter how big or small the circle gets.

Estimates of it appear in the works of ancient Greek,

it had been calculated to as far as ten decimal places.

So, when did they finally figure out the exact value

of a circle's circumference to its diameter

but no matter how precise the fraction is,

That's why, instead of trying to write out

we just refer to it using the Greek letter pi.

to calculate it up to two quadrillion digits.

Well, just about any calculations involving circles,

Because it's also useful in studying curves,

pi helps us understand periodic or oscillating systems

In statistics, pi is used in the equation

to calculate the area under a normal distribution curve,

which comes in handy for figuring out distributions

or margins of error in scientific results.

pi is used in particle physics experiments,

such as those using the Large Hadron Collider,

because of the orbits in which tiny particles move.

to calculate the density of our entire universe,

Subtitles ListPlay Video

【TED-Ed】The infinite life of pi - Reynaldo Lopes

bit

ancient

measure

tiny