Current Events > Why is Pi [The number thing] so special?

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Bad_Mojo
12/27/19 1:40:37 AM
#1:


I'm very, very terrible at math so I don't understand a lot of things based on it

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MrNintendo1213
12/27/19 1:42:46 AM
#2:


It's fairly self explanatory. It's the ratio of the diameter of a circle and its circumference.
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Bad_Mojo
12/27/19 1:44:11 AM
#3:


MrNintendo1213 posted...
It's fairly self explanatory. It's the ratio of the diameter of a circle and its circumference.

Why does it have so many digits after the 3.14? The size of a circle?

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Foppe
12/27/19 1:50:46 AM
#4:


The point is that it is always the same number, no matter the size of the circle.

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Bad_Mojo
12/27/19 1:52:02 AM
#5:


Foppe posted...
The point is that it is always the same number, no matter the size of the circle.

Then why isn't it just 3.14? Why all the other numbers?

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brotrrwinner
12/27/19 1:52:58 AM
#6:


What if it's a square circle?

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Turtlebread
12/27/19 1:53:00 AM
#7:


because more numbers mean more smarter

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Bad_Mojo
12/27/19 1:54:06 AM
#8:


brotrrwinner posted...
What if it's a square circle?

Then it's fake, just like pro wrestling

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SSJKirby
12/27/19 1:54:06 AM
#9:


more numbers mean a more accurate measurement, and the numbers haven't repeated themselves far as I know which is what makes it fascinating to math people

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Foppe
12/27/19 1:54:11 AM
#10:


Bad_Mojo posted...
Then why isn't it just 3.14? Why all the other numbers?
Because it is an extremely long number, but 3.14 is good enough to use in math.

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Medussa
12/27/19 1:54:25 AM
#11:


it has infinite digits because that particular ratio ( circumference / diameter) can't be expressed as a fraction.

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Bad_Mojo
12/27/19 1:55:53 AM
#12:


SSJKirby posted...
more numbers mean a more accurate measurement

But that other person just said that's what all circles are. What do you mean more accurate? I thought they said that's just what circles are

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Bad_Mojo
12/27/19 2:00:41 AM
#13:


Okay, thanks, everyone

Now explain calculus to me, please

I made this topic thinking about the Zeno Paradox [How can you make it anywhere if you keep halving the distance] and found out that's why calculus was made, so solve that question. And they did it

Could anyone shed some light on this to a big dummy like me?

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SSJKirby
12/27/19 11:34:27 AM
#14:


Point A and Point B have C distance between them

Dividing the distance in half between them means you'll never reach 0, because anything divided by 2 can't reach 0.

So if you throw something at someone, mathematically it'll never hit them

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Vicious_Dios
12/27/19 11:35:05 AM
#15:


@PiOverlord

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BillORileyReid
12/27/19 11:40:54 AM
#16:


SSJKirby posted...
Point A and Point B have C distance between them

Dividing the distance in half between them means you'll never reach 0, because anything divided by 2 can't reach 0.

So if you throw something at someone, mathematically it'll never hit them


but it does hit them

so calculus is all theroetical bullshit
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Shadow Don
12/27/19 11:41:41 AM
#17:


Bad_Mojo posted...
Okay, thanks, everyone

Now explain calculus to me, please

I made this topic thinking about the Zeno Paradox [How can you make it anywhere if you keep halving the distance] and found out that's why calculus was made, so solve that question. And they did it

Could anyone shed some light on this to a big dummy like me?

It's because some infinite sums of numbers can actually converge to a finite number. The series 1/2 + 1/4 +1/8 +1/16 + .... Converges to 1, which is the crux of the Zeno Paradox.

It took mathematicians more than a century even after Isaac Newton and Leibniz invented calculus to truly work out some of the complexities of infinite sums. They are really tricky to use if you don't know what you are doing. For instance, if you have a series that doesn't converge absolutely and you try to rearrange the terms you can end up with totally arbitrary results like 0=1. A mathematician famously did that and thought he had a mathematical proof for the existence of god.

Bad_Mojo posted...
Then why isn't it just 3.14? Why all the other numbers?

Like someone already said, it's an irrational number and thus has infinite digits. It would be really inconvenient to have to write out all those digits especially considering how ubiquitous it is in math, physics and engineering. That's why it's represented by the greek letter pi. It's simply the ratio of the circumference of any given circle over its diameter.

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PiOverlord
12/28/19 10:52:29 AM
#18:


There is nothing special about pi, it's a useless number.

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luigi13579
12/28/19 11:01:37 AM
#19:


PiOverlord posted...
There is nothing special about pi, it's a useless number.
e is where it's at.
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lilJoe457
12/28/19 11:10:02 AM
#20:


A squared plus b squared equals c squared

Thanks Pythagoras.

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Rikiaz
12/28/19 11:48:47 AM
#21:


PiOverlord posted...
There is nothing special about pi, it's a useless number.
Tau is really where its at. Pi really is comparatively useless.

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Unknown5uspect
12/28/19 12:08:22 PM
#22:


Medussa posted...
it has infinite digits because that particular ratio ( circumference / diameter) can't be expressed as a fraction.
Not that people haven't tried (22/7)
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Tyranthraxus
12/28/19 12:11:02 PM
#23:


Unknown5uspect posted...
Not that people haven't tried (22/7)
22/7 is also an approximation.

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#24
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BillORileyReid
12/28/19 6:50:34 PM
#25:


Pi is only infinite digits because we work in base 10

If we worked in a different base it would be a whole number.
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Medussa
12/28/19 6:51:08 PM
#26:


BillORileyReid posted...
Pi is only infinite digits because we work in base 10

If we worked in a different base it would be a whole number.

uh, no. unless we're in base pi.

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BillORileyReid
12/28/19 6:51:58 PM
#27:


Medussa posted...


uh, no. unless we're in base pi.


I meant to say the digits wouldn't be infinite
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Medussa
12/28/19 6:53:23 PM
#28:


I'm pretty sure they still are. irrational is irrational.

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LordFarquad1312
12/28/19 6:54:17 PM
#29:


BillORileyReid posted...
I meant to say the digits wouldn't be infinite
Yes they would, unless we used base pi

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kirbymuncher
12/28/19 6:58:24 PM
#30:


LordFarquad1312 posted...
Yes they would, unless we used base pi
this sounds like the worst number system ever

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LordFarquad1312
12/28/19 7:07:04 PM
#31:


kirbymuncher posted...
this sounds like the worst number system ever
I'd be pretty good for working with circles, spheres and anything in between.

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Tyranthraxus
12/28/19 7:26:32 PM
#32:


LordFarquad1312 posted...
I'd be pretty good for working with circles, spheres and anything in between.
For the most part radians accomplishes any benefit we would get from base pi without actually changing any existing math.

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Notti
12/31/19 5:49:12 AM
#33:


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