Name: 円周率は（まだ）間違っています。 (Pi Is (still) Wrong.)
Uploaded: 2021-01-14T10:28:35.000Z
Duration: 5 min 17 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Let's say you're me, and you're in math class.

And you're supposed to be learning trigonometry,

but you're having trouble paying attention

The ratio of a circle's diameter to its circumference

I mean that pi, as a concept, is a terrible mistake that

has gone uncorrected for thousands of years.

as the problem with Columbus and Columbus Day.

Sure, Christopher Columbus was a real person who did some stuff.

But everything you learn about him in school

You learned in school that pi is the all-important circle

constant, and had to memorize a whole bunch of equations

If you found any of these equations confusing,

Good system for measuring angles when it comes to mathematics.

The full 360 degrees of pi is actually 2 pi.

Say I ask you how much pie you want, and you say pi over 8.

You'd think this should be an eighth of a pie.

Or multiply by 2, if you're going the other way.

So you just have to make sure you pay attention to which way

Mathematics should be as elegant and beautiful as possible.

should be as simple as one pi equals one pi by adding all

these conversions, something gets lost in translation.

have to do to make a pie be 1 pi instead of 2 pi.

You could redefine pi to be 2 pi or 6.28.

But I don't want to redefine pi because that

A half circle would be half tau, or tau over 2.

And if you want 1/16 of this pie, you want tau over 16.

But Vi, you say, that seems rather arbitrary.

would be annoying to have to convert between tau and pi

But the way of mathematics is to make stuff

So let's see what happens if we use tau in other equations.

Math classes make you memorize stuff like this,

I mean, sure you could derive these values every time.

But you don't, because it's easier to just memorize it.

Or use your calculator, because pi and radians are confusing.

which is how high this point is when you've gone however

When your radians are notated horrifically,

Let's make a sine wave starting with tau at 0.

At tau over 4, we've gone a quarter of the way

to do the extra step of the in-your-head conversion of pi

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円周率は（まだ）間違っています。 (Pi Is (still) Wrong.)

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