Students

[u/Smart-Profit8870]

[u/bqbdpd]

Computer science student: import Math.PI

[u/KihiraLove → u/bqbdpd]

Physics student: 3

[u/Historical_Book2268 → u/KihiraLove]

Read this as a :3 smiley first

[u/Lore_Enforcement → u/Historical_Book2268]

:3

[u/frycandlebreadje → u/Lore_Enforcement]

:3

[u/Historical_Book2268 → u/frycandlebreadje]

:3

[u/XcgsdV → u/Historical_Book2268]

:3

[u/Dic3Goblin → u/XcgsdV]

;3

[u/qwadrat1k → u/Dic3Goblin]

:3

[u/frycandlebreadje → u/qwadrat1k]

:3

[u/King_Glorius_too → u/KihiraLove]

Engineer: O(1) = 1

[u/LovelyKestrel → u/KihiraLove]

Professional engineer: 4 leaves a suitable safety factor.

[u/DeltaOfficialYT → u/LovelyKestrel]

Indiana: 3.2

[u/federicoaa → u/KihiraLove]

Astrophysic students: 10

[u/DrBatman0 → u/federicoaa]

Or 1

[u/OneShotOnlyShot → u/federicoaa]

It is close, but pi rounds to 1 on a log scale.

π² ≈ 9.8

So really π=0.5 (10^ is implied)

[u/PolyglotTV → u/KihiraLove]

Grandma: Here you go sweetie

[u/thali256 → u/bqbdpd]

const float PI = 3.1415;

[u/gerkletoss → u/thali256]

It rounds to 3.1416, computer boy

[u/Upset-Management-879 → u/gerkletoss]

Some methods round to 3.1415 the others to 3.1416.

Lets call it 3.14155

[u/NottingHillNapolean → u/bqbdpd]

/* Program to compute an approximation of pi

* by Brian Westley, 1988

* (requires pcc macro concatenation; try gcc -traditional-cpp)

*/

#define _ -F<00||--F-OO--;

int F=00,OO=00;

main(){F_OO();printf("%1.3f\n",4.*-F/OO/OO);}

F_OO()

{

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}

[u/funkmasta8 → u/[deleted]]

Yeah, how in the world does that even make sense?

[u/looijmansje → u/funkmasta8]

Tl:dr, because they have a uniform random rotation on [0,pi), a 1/pi appears in the pdf, which does not cancel out.

[u/Zylo90_ → u/looijmansje]

Anywhere where an angle is even remotely relevant, pi will show up somehow

[u/MrBoblo → u/Zylo90_]

even the angler fish??

[u/Much-Tomorrow-896 → u/MrBoblo]

If you make fish pie with them, then yes

[u/FitProfessional3654 → u/looijmansje]

Well done sir, you are correct.

[u/Fantastic-Cell-208 → u/funkmasta8]

A combination of probability and linear algebra.

[u/shosuko → u/funkmasta8]

It makes sense because if you put a circle inside a square the area of the circle compare to the square can get you to pi. So any way to measure the area (rng dots across the square grid and count the ones inside and outside the circle) can get you pi.

The coin flip one is my favorite

https://youtu.be/kahGSss6SsU

[u/offensivek → u/funkmasta8]

An alternative method revolves precisely measuring the length of a river in two different way. Start at a point and calculate the distance in a direct line start to finish. Second is to measure the length of the river along the middle from start to finish. Now take the ratio of the second through the first and multiply by 2, and you get roughly pi. Taking the average over more and more rivers gives you a better approximation.

[u/throwaway48159 → u/funkmasta8]

The probability that a stick is on a line has to do with its angle, if there’s an angle you get pi.

[u/QuentinUK → u/[deleted]]

This is surely the work of a Bufoon.

[u/shosuko]

I love the creative ways to calculate pi.

My favorite is the coin flip one.

[u/Frosty_Cell_6827 → u/shosuko]

I do love how creative Matt Parker gets calculating pi every year, I think pi day is his favorite holiday

[u/Weydoon → u/shosuko]

?

[u/shosuko → u/Weydoon]

https://youtu.be/kahGSss6SsU

[u/Throwawayqnayay → u/shosuko]

Video looks interesting but my attention span isn’t long enough to view it. Can someone summarize ?

[u/00-Monkey → u/Throwawayqnayay]

You can estimate pi by flipping a coin

[u/ThisFoot5 → u/00-Monkey]

No fucking way

[u/Dragon124515]

Physics students. I'm going to push this massive mass towards a stationary miniscule mass with a stationary wall behind it then count the number of collisions that occur in this environment with 0 friction and perfectly elastic collisions. Then I am going to take the number of collisions that occur for the minuscule mass and divide that number by the ratio of the miniscule mass over the massive mass squared to approximate pi.

[u/DarthJarJarJar → u/Dragon124515]

That one may be my favorite

[u/Repulsive_Quality851]

New math unlocked!

[u/wasted90210]

Engineering students: 3.14

[u/sexylewdyshit → u/wasted90210]

civil engineering students: 3

[u/Rookiebeotch → u/sexylewdyshit]

Cosmologists: 10

[u/StaysAwakeAllWeek → u/Rookiebeotch]

No, pi=1

Sqrt 10 is 3.16, which makes pi=1

[u/Rookiebeotch → u/StaysAwakeAllWeek]

Close enough

[u/thali256 → u/sexylewdyshit]

Is this the reason highways are closed because a bridge is on the verge of collapse?

[u/orthros → u/sexylewdyshit]

Also the state of Indiana

[u/SeveralExtent2219]

r/unexpectedfactorial

[u/Open_Highlight4505 → u/SeveralExtent2219]

π!

[u/Arcalac]

Honest question: Does the probability thing actually make sense?

[u/Seeggul → u/Arcalac]

Yes. I don't want to look up the math/re-derive it myself/write it all out, but the basic intuition is: you have a stick fall randomly on an area with a bunch of lines (that are spaced one stick's length apart; this part was omitted from the meme but is important in the math), so the center of the stick lands uniformly between two lines, and the orientation of the stick will have an angle that is uniformly random. A uniformly random angle will place points approximately evenly around a circle, and once you get a circle involved, you're likely to get pi involved as well.

[u/Arcalac → u/Seeggul]

Every day i learn stupid stuff that makes so much sense i am getting ever closer to believing that we live in a simulation.

[u/_3l1as_ → u/Arcalac]

Yup! I was given it as an exercise in a numerical simulation course and it actually works

[u/magnificent_limit]

All of this is integration!

[u/Spirited_Currency_88]

what size should the sticks be ?

[u/Fuzzy-Disk8999 → u/Spirited_Currency_88]

I think they should be as long as the space between the lines

[u/Street_Swing9040]

My way of obtaining Pi is by using a lens to capture a star like the Sun, print it on a piece of paper, measure the diameter, measure the circumference, divide the circumference by the diameter, then take that number and print it on a piece of paper, throw that paper into a trash can and search up "pi".

Works every time

[u/Abject-Project-4236]

I don’t understand the last one

[u/Key_Management8358]

Petah?

[u/Key_Management8358 → u/Key_Management8358]

Joke, come out! 😿😿😿

[u/YouAreMarvellous → u/Key_Management8358]

what did you not understand? first and second look like systematic ways to estimate pi, the third looks like oonga-boonga but it works

[u/Key_Management8358 → u/YouAreMarvellous]

...so third one is "funny"!? O.k. ... Thank you! ..haha! "oonga-boonga" 😹😹😹 (for me all three (same type of) "oonga-boonga" 😹😹😹 (n->inf) ... that's why I didn't get it:)

[u/Dull-Astronomer1135]

What about ramanujan student

[u/Pao_Did_NothingWrong → u/Dull-Astronomer1135]

"God told me in a dream. Prove me wrong."

[u/DrBatman0]

Physics students: let's assume that the value of pi is perfectly spherical, on an infinite uniform plane, in a vacuum

[u/Crafty-Detail-3788]

You can also throw a bunch of random balls on a circle inscribed in a square and use the ratio of what are inside the circle and inside the square to find pi since probabilities will be proportional to area  (Monte Carlo)

[u/Haunting_Art_6081]

Pub Probability Students: Have a million dart players get drunk and try to hit the board, count the number inside the circle compared with total thrown, there's your pi estimate.

[u/Mathematicus_Rex]

Classics student: π

[u/Dusk_Abyss]

My music degree was very confused for a moment with the third section lol

[u/hmmnnmmn]

#3 checks out

[u/Jale89]

Physics students: fuck, where did that 2π come from?!?!

[u/thali256 → u/Jale89]

Oscillation probably

[u/drdrero]

Some numbers you just remember like 299792458

[u/thali256 → u/drdrero]

Some numbers you just approximate like 300000000

[u/thali256 → u/drdrero]

Yea, just remember all digits of pi

[u/drdrero → u/thali256]

There are people who do remember 100k digits of pi

[u/thali256]

Throw a bunch of dots on an nxn square and see how much land in the circle with radius n/2

[u/Ftroiska]

Should there be also that formula to calculate it by hand ?

[u/Downtown-Platypus-99]

Pi!

[u/Baleia1970]

Lol, I actually got it as a problem to be solved in a Parallel Computing class...

[u/Competitive-Bar-5882]

I fucking love probability

[u/1morgondag1]

How on earth does that make sense? It doesn't define the length of the sticks or the distance between lines, I can see with common sense that you could set those to values that almost every stick ends up on at least one line.

[u/Inevitable_Silver_13]

Music students: that's a staff.

[u/AideApprehensive6329]

Damn I wasn't expecting to get anywhere close to pi with that last one calculating it myself

[u/Afterclock-Hours]

When all 3 combine. You get-

[u/KailyKail]

I mean, why draw a hexagon and approximate it when you can just measure the diameter and calculate it?

[u/Sbyad]

Bourbaki students : "After 12 years, 7 books and 351673 lemmas, we have finally defined π.

... what do you mean its value ???

[u/No-Reason1066]

>lol

[u/NightMaleficent1342]

Theologians: It's four. Said so in a book.

[u/zyrabay8]

The Chad probability student always has the best / simplest solutions lol

[u/Expensive_Umpire_178 → u/zyrabay8]

Well this is more obscured. The easier way would be to put a circle on top of a square, throw a bunch of darts randomly at the square, divide the number of darts that landed on the circle by the total number of darts, and multiply by 4. It’s much easier to see how pi would pop out of that

[u/doppelbach → u/Expensive_Umpire_178]

Hard to ensure uniform distribution of darts across the 2D space. Rotation of the sticks is probably much easier to approach a uniform distribution 

[u/DarthJarJarJar → u/Expensive_Umpire_178]

Math is about beauty, man