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fckreddit , to science_memes in Let π = 5

Ancient Greek Mathematicians would be so disappointed. Even they knew that pi is between 3.1 and 3.2.

leavemealone , to science_memes in Let π = 5

You should cross in red the whole question and write

come see me after class !

onlinepersona , to linuxmemes in It's so similarly pronounced to the SI prefix that it can also be 1000 Manjaros

Kil = church in gaelic --> Kilimanjaro = Church of Manjaro.

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Got_Bent , to lemmyshitpost in Let π = 5

π = 5 for very small values of r.

FlyingSquid , to lemmyshitpost in Let π = 5
@FlyingSquid@lemmy.world avatar
Underwaterbob , to lemmyshitpost in Let π = 5

Makes me miss the days of 22/7.

xx3rawr , to lemmyshitpost in Let π = 5

Pi is now 5 due to inflation

SloppySol , to lemmyshitpost in Let π = 5

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 ,

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 ,

Reading that comment was a wild ride! It started off innocuous enough, but really went off the rails FAST!

leaky_shower_thought , to lemmyshitpost in Let π = 5

suspension of belief is also being tested, I see.

praise_idleness , to lemmyshitpost in Let π = 5

obviously it’s inflation index

Evilsandwichman , to science_memes in Let π = 5

They’re rounding down

jordanlund , to science_memes in Let π = 5
@jordanlund@lemmy.world avatar

Well, with those numbers, it’s easy math. :)

V=510^210

5,000. 5,000 what though?

Even with a proper π value, it still doesn’t make sense… 3,141.59265359

EddoWagt ,

What? Its just the volume, without units. What part of it doesn’t make sense?

jordanlund ,
@jordanlund@lemmy.world avatar

Well, a r=10 and h=10 doesn’t mean much without units. 10 what? Feet? Meters? Inches? CM?

Let’s take the OG numbers and assume feet, so 5,000 cubic feet. That’s not a useful volume measurement.

1 cubic foot of water = 7.48052 gallons

So 5,000 cubic feet of water = 37,402.6 gallons. That’s a viable volume measurement.

1 cubic meter = 1,000 liters.

5,000 cubic meters = 5,000,000 liters.

EddoWagt ,

Well, a r=10 and h=10 doesn’t mean much without units. 10 what? Feet? Meters? Inches? CM?

Its not supposed to mean anything, it’s about the equation not about the end result. We’re not calculating an actual cilinder

Tlaloc_Temporal ,
@Tlaloc_Temporal@lemmy.ca avatar

If we’re not calculating something useful, then why are we here and not in the library learing about the universe?

Better question: What curvature of space is necessary for the apparent value of π to be 5?

EddoWagt ,

If we’re not calculating something useful, then why are we here and not in the library learing about the universe?

We’re learning maths, which is arguably the foundation of the universe.

Better question: What curvature of space is necessary for the apparent value of π to be 5?

I’m afraid that that is beyond the comprehension of my human existence

MinekPo1 , (edited )
@MinekPo1@lemmy.ml avatar

Better question: What curvature of space is necessary for the apparent value of π to be 5?

honestly I don’t know if there is any way to measure curvature of space , but its slightly more curved than the surface of a ball (where π=~4.712)

edit : its more complex than that and topology of non euclidean spaces hurts

MBM ,

Kind of curious how you got that value. I think the ratio of circumference to diameter (“pi”) is actually smaller in spherical geometry, in the most extreme case (the equator) it’s just 1. You could say “pi = 5” for circles of a specific radius in hyperbolic geometry, I guess.

MinekPo1 ,
@MinekPo1@lemmy.ml avatar

my mistake was using the sum of angles in a triangle which was kinda dum but whatever . I also tried calculating via the circumstance of a circle placed at a pole where π was 20x smaller for the case I was using but its not linear so I looked deeper which was a big mistake .

BTW the ratio of circumstance to radius for a circle which is also an equator of the space is ¼ not 1 (r=½π₀ , C=2π₀) .

MBM ,

BTW the ratio of circumstance to radius for a circle which is also an equator of the space is ¼ not 1 (r=½π₀ , C=2π₀) .

I think you mean 4, which makes the ratio of circumference to diameter 2 (either way, no idea how I messed up that one).

MinekPo1 ,
@MinekPo1@lemmy.ml avatar

oopsie :3

FuglyDuck ,
@FuglyDuck@lemmy.world avatar

The unit is unit.

The math doesn’t care, and what you’re on about only really matters if the units don’t start as all the same or if you start converting between things.

exocrinous ,

Five thousand cubic units

Steve ,

Literally the correct answer. Must be a bunch of engineers in this thread.

mnemonicmonkeys ,

No, engineers wouldn’t have a problem with this. This dude is just some rando that has no idea what he’s whinging about

bobs_monkey ,

Just calculating a cylinder that may or may not have an m&m minis tube stuck on it

Sagar , to science_memes in Let π = 5

I smell a quantum mechanics professor there.

tormeh ,

Astronomers would round pi to 1.

Tlaloc_Temporal ,
@Tlaloc_Temporal@lemmy.ca avatar

Or 10, whatever. The precise value is only relevant when measuring the curve of space, and they’ll still disagree with mathematicians on most of the digits.

Lemvi , to lemmyshitpost in Let π = 5

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 ,

Intel®️ inside

flambonkscious ,

Wow, that takes me back - you’re referring to the floating point bug from …98?

elvith ,

665.999999657838 the floating point number of the beast

FlyingSquid ,
@FlyingSquid@lemmy.world avatar

It’s posts like these that makes me think we’re all old here on Lemmy and then I get a response from someone who tells me they’re 18…

Gork OP ,
lugal ,

Maybe e is 5, too?

MadBob ,

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.

gimpchrist ,
@gimpchrist@lemmy.world avatar

Or as I like to call pi…the little symbol thingy. But exactly yes, you get it.

skulblaka ,
@skulblaka@startrek.website avatar

Except pi isn’t a variable. It is a known value that we refer to as pi for convenience, and pi is a fundamental aspect of how a circle is. Saying “let pi equal 5” is all fine and well but is physically impossible, you will not be determining the volume of a cylinder if you let pi equal 5, because the ratio of a circle does not equal 5, it equals 3.14

gimpchrist ,
@gimpchrist@lemmy.world avatar

Okay but they didn’t say 3.14 they made a little symbol thingy

MadBob ,

But I suppose part of solving a maths problem is staying within the confines of the question and listening to instructions, so if someone says “using pi equals 5”, I’d just use pi equals five and take my point with grace.

rooster_butt ,

But the question is saying to find the volume of a cylinder. Which its clearly wrong.

maynarkh ,

Well, if we want to be pedantic, they never said that h is the height and r is the radius of the base circle. They could be just random numbers.

Also, since we never calculate with all the digits of pi, it is not any less weird to round to the nearest 5 and say that it’s 5, than to the nearest 0.01 and saying it’s 3.14. It just has a higher amount of rounding error.

GiveMemes ,

Why are we upset by rounding to the nearest 5 for elementary schoolers when we round to 10 m/s/s for gravity in collegiate physics classes anyway?

maynarkh ,

It’s not even a bad thing to do for quick mental calculations, if you know that you will overshoot. Multiplying by 5 is easy.

CaptSneeze ,

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”.

MadBob ,

Well I suppose for example rounding to the nearest integer is a method of implying “let 1.8 = 2”, no? Not too outlandish, I don’t think.

Eatspancakes84 ,

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 ,

It would be theoretically possible in a universe based upon non-Euclidean geometry.

gbzm , to lemmyshitpost in Let π = 5

I think I just got it! Pi is very close to 5 dB (~4.9714 dB)

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