Having Pi equal five definitely does not help the world go round.
Let π = 5
Submitted 1 year ago by Gork@lemm.ee to [deleted]
https://files.catbox.moe/hjclod.jpg
Comments
Aurenkin@sh.itjust.works 1 year ago
Iron_Lynx@lemmy.world 1 year ago
To be Devil’s Advocate:
Given that the rest written in Comic Sans, it may be an early elementary school exercise, aimed at teaching kids to do multiplications. In this case, it’s tolerable and/or defensible to find a simplification for pi.That said, making pi equal to 3 would have been more accurate for that…
Duamerthrax@lemmy.world 1 year ago
Unless the kid is even slightly above average and finds the idea that pi equaling 5 confusing.
NucleusAdumbens@lemmy.world 1 year ago
…if they’re above average, I think they’ll figure out the explicitly defined variable. I think the instructor is trying to make sure this problem doesn’t require a calculator and figured defining pi as 5 makes it clear that you can treat it as a whole number. 3 would be more accurate and just as easy, but meh idk that this is that great of a blunder.
ColeSloth@discuss.tchncs.de 1 year ago
That’s a dumb way of teaching and you are a dumb devils advocate for saying it. Go to H E double hockey sticks.
Papergeist@lemmy.world 1 year ago
Even in engineering it is common to just round pi to 3 and quickly estimate whatever it is your doing.
GladiusB@lemmy.world 1 year ago
I need a new maitre’d for a restaurant I am opening. How busy are you?
bluewing@lemm.ee 1 year ago
Or it’s from an ME. They seldom can remember the rounded value of Pi, but they’re pretty sure it’s somewhere between 3 and 4. But you probably should use 5 just to be safe…
lowleveldata@programming.dev 1 year ago
That’s how you know math is OP when you can calculate volumes in parallel worlds where circles don’t even looks like circles
DumbAceDragon@sh.itjust.works 1 year ago
carpelbridgesyndrome@sh.itjust.works 1 year ago
Bringing new meaning to the phrase “assume cows are spherical”
Kolanaki@yiffit.net 1 year ago
They’re just rounding up from “3.”
errer@lemmy.world 1 year ago
And not that pussy rounding up where you go up by only 1, oh no, we’re rounding up 2 baby.
Resol@lemmy.world 1 year ago
The value of Euler’s number is now 4.
downpunxx@fedia.io 1 year ago
pi, as it turns out, is just the friends we made along the way
orphiebaby@lemm.ee 1 year ago
Wow, 5 friends is more than what I have!
ThatFembyWho@lemmy.blahaj.zone 1 year ago
Damn inflation is everywhere now, even the transcendentals :'(
Rolando@lemmy.world 1 year ago
This is how the wealthy calculate their tax exemptions.
JasonDJ@lemmy.zip 1 year ago
Due to inflation, they now have a bigger pi.
InternetCitizen2@lemmy.world 1 year ago
This guy has think tank fellowship written all over them.
orphiebaby@lemm.ee 1 year ago
I bigger pi-ness.
Lemvi@lemmy.sdf.org 1 year ago
With π=5 maths break down completely. If π=5, then e^(5i) = -1, meaning -1 = cos(5) + i * sin(5), or -1 ≈ 0.284 - 0.959 i
Hupf@feddit.de 1 year ago
Intel®️ inside
flambonkscious@sh.itjust.works 1 year ago
Wow, that takes me back - you’re referring to the floating point bug from …98?
MadBob@feddit.nl 1 year ago
I think you’re overthinking it. The first thing you’re told when you learn algebra is that a letter represents a number and you can say “let a equal (number), b equal (number)…” so you can let pi equal whatever you want for the purposes of one simple problem.
rooster_butt@lemm.ee 1 year ago
But the question is saying to find the volume of a cylinder. Which its clearly wrong.
CaptSneeze@lemmy.world 1 year ago
You’re talking about variables. But, pi isn’t a variable, it is a constant number. This would be more akin to saying “let 7 = 9”.
gimpchrist@lemmy.world 1 year ago
Or as I like to call pi…the little symbol thingy. But exactly yes, you get it.
lugal@lemmy.world 1 year ago
Maybe e is 5, too?
Eatspancakes84@lemmy.world 1 year ago
I think it’s actually a very interesting question. Pi does not equal 5 in our universe, but perhaps we can think of a meaningful universe where it does? Perhaps some mathematicians/physicists can chime in?
toddestan@lemmy.world 1 year ago
It would be theoretically possible in a universe based upon non-Euclidean geometry.
RegalPotoo@lemmy.world 1 year ago
Idk, if you want to test people on how they understand formulae and order of operations without letting them just punch it into a calculator. The actual math isn’t hard, but if you don’t get substituting values into an equation then it’s not trivial
pumpkinseedoil@feddit.de 1 year ago
Just let π be 3 …
Norgur@fedia.io 1 year ago
Or have them learn how to use a calculator at the same time.
ulterno@lemmy.kde.social 1 year ago
When you want students to not use calculators but still rate a question for 10 second answer.
bradinutah@thelemmy.club 1 year ago
“One! Two! FIVE!” “Three, Sire!” “THREE!”
visc@lemmy.world 1 year ago
That just means the curvature of spacetime is negative.
Got_Bent@lemmy.world 1 year ago
π = 5 for very small values of r.
simplejack@lemmy.world 1 year ago
New New math
tigeruppercut@lemmy.zip 1 year ago
HopFlop@discuss.tchncs.de 1 year ago
eugene171@lemmy.world 1 year ago
My favorite is when doing Order of Magnitude estimations, you are supposed to let pi = 1
FlyingSquid@lemmy.world 1 year ago
Ah, Indiana math.
FiniteBanjo@lemmy.today 1 year ago
I would be a smartass and leave Pi as a factor throughout and in the answer. I’m used to doing that in Calculus anyways.
V = πr^2^h
V = π⋅10^2^⋅10
V = π1000
BONUS SOLUTION:
V =∫~0~^10^ A⋅h dh
A = ∫~0~^10^ 2πr dr
V= ∫~0~^10^ h⋅∫~0~^10^ 2πr dr dh
π is a constant so we can safely remove it from A’s integral
A = π⋅∫~0~^10^ 2r dr
A = π⋅[r^2^]~0~^10^
A = π⋅( [10^2^] - [0^2^] )
A = π10^2^
A = π100
V = ∫~0~^10^ h⋅π100 dh
π100 is a constant so we can safely remove it from V’s integral
V = π100⋅∫~0~^10^ h dh
V = π100⋅[h]~0~^10^
V = π100⋅([10] - [0])
V = π100⋅10
V = π1000
It goes a lot deeper but I’m not bored enough for that, yet.
benignintervention@lemmy.world 1 year ago
If you really wanted to be through you’d start at a point, integrate out along dr for a line, then integrate in a circle through dtheta to derive the area before doing the rest
gimpchrist@lemmy.world 1 year ago
Nobody knows how to think like a dyscalculic at all haha… it’s just a little symbol thingy… it doesn’t have to be pi. Just like X is a little symbol thingy… the x is now just kind of a table right now… it’s just a little symbol thingy and it means five it’s not that difficult. Lmao
Agrivar@lemmy.world 1 year ago
Here’s a little LPT for you: you can be correct without being an obnoxious douchebag about it.
petrol_sniff_king@lemmy.blahaj.zone 1 year ago
Yeah, “symbol thingy” is setting me off rn.
The only thing that can help me is filing my taxes incorrectly.FanBlade@lemmynsfw.com 1 year ago
Your message reads kinda douchey.
nyctre@lemmy.world 1 year ago
Yes it does have to be pi because that’s the formula for the volume of a cylinder. If you take a simple, cylindrical glass and measure it and apply the formula with pi, you’ll see that you’ll get the correct volume of the glass. If you just want your kids to calculate a random x that’s 51010*10 just tell them to do that don’t give them a made up formula, it’s not that difficult.
petrol_sniff_king@lemmy.blahaj.zone 1 year ago
Mathematically, no, it does not. We make up the definitions. If you wanted to see what the consequences of a, I don’t know, 5-dimensional universe with Pi set to 5.65 were, you can do that. These are scribbles on pages, there is literally nothing stopping you.
Academically, what’s stopping you is whether these calculations are useful. The only problem I see here is that it’s kind of misleading to imply to someone that Pi is something it conventionally isn’t. But even then, I think I’d respect the mathematician who could recognize Pi as a symbolic name for, usually, one particular transcendental constant a little bit more than one who refused to even entertain the idea. Like, imagination is important to mathematics, too.
And to be clear, “let Pi = 3.14” is also incorrect. It is closer than 5, but it is still infinitely wrong.
danc4498@lemmy.world 1 year ago
This physics class?
threelonmusketeers@sh.itjust.works 1 year ago
Astronomy.
random_character_a@lemmy.world 1 year ago
…in spacetime with high curvature?
kuberoot@discuss.tchncs.de 1 year ago
Doesn’t curvature cause pi to not be a constant? And wouldn’t it be negative curvature that would cause it to be higher than euclidean space?
Underwaterbob@lemm.ee 1 year ago
Makes me miss the days of 22/7.
HeChomk@lemmy.world 1 year ago
The answer is substantially different though. 3141 units (rounded correctly) vs 5000. That’s a significant margin that even working it out in your head is not forgiving enough to cover.
Unless I fucked up.
bi_tux@lemmy.world 1 year ago
pi was mutable all along
Agent641@lemmy.world 1 year ago
Pi = phi
SloppySol@lemm.ee 1 year ago
Numbers are symbolic, I’d say it’s not a bad piece of writing to supplement a lesson that numbers are to be respected but ALSO to always know that they mean nothing without context.
We can appreciate the beauty of infinity in memorizing pi, but the reality we live in demands actions of whatever the fuck it is we redefine volition, will, or passion to.
I think people can be so much more, but my idea of more is tainted by the values I have. Not everyone would agree with the idea that we all deserve to live.
Survival of the fittest, they support indirectly. With actions that include the advent of modern advertising. The CIA(?) experiment on attention, catalyzed by the creation of lsd in the knowledge-obtaining-goal of understanding the mechanics of attention, were directly related to the patriot act.
I’m not claiming anything other than the fact that our “leaders,” have used their knowledge of attention spans to sway the, “masses.” The rest of us.
How do you think of the, “rest of us?”
I hope you teach your children that, and that math is the beauty we’ve come to understand in our millennia of evolutionary timescales, of fucking struggle.
You have within you, much.
Do not waste the years of before, do something to help. Not your country, but your reality. The outside. You’re something. Not “nothing but a part of.” There’s so much in the word, “just.”
That’s all I have to say. Just that. Not much. Just a tiny little wall. Sorry. I write, and I rant, and I let go. Please don’t ban me. I matter and I’m not hateful. I’m sorry.
tfw_no_toiletpaper@lemmy.world 1 year ago
I truly wonder what sprouted this comment. We’re all taking about how this one teacher butchered math by rounding π completely incorrect and you’re posting this half-rambling, idk if medicaments-induced, pseudo intellectual crap. This has 0 to do with it, go to some DMT board.
Agrivar@lemmy.world 1 year ago
Reading that comment was a wild ride! It started off innocuous enough, but really went off the rails FAST!
Sam_Bass@lemmy.world 1 year ago
Nother one of them “uncertified teachers” huh
some_guy@lemmy.sdf.org 1 year ago
500? But I just woke up and I take sleeping pills so my brain might not be working.
fushuan@lemm.ee 1 year ago
510**210 = 51010*10 = 5000
some_guy@lemmy.sdf.org 1 year ago
Good thing I don’t need to do math at work. Saw a video the other day where someone said “10x400” and was shocked that they couldn’t instantly multiply by a power of ten. And then I walked into this.
leaky_shower_thought@feddit.nl 1 year ago
suspension of belief is also being tested, I see.
gbzm@lemmy.world 1 year ago
I think I just got it! Pi is very close to 5 dB (~4.9714 dB)
xx3rawr@sh.itjust.works 1 year ago
Pi is now 5 due to inflation