808
Let π = 5 (files.catbox.moe)
submitted 1 year ago by Gork@lemm.ee to c/lemmyshitpost@lemmy.world
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[-] xx3rawr@sh.itjust.works 100 points 1 year ago

Pi is now 5 due to inflation

[-] Aurenkin@sh.itjust.works 71 points 1 year ago

Having Pi equal five definitely does not help the world go round.

[-] nilloc@discuss.tchncs.de 7 points 1 year ago

Wouldn’t it make it seem like a bigger place?

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[-] Iron_Lynx@lemmy.world 68 points 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 12 points 1 year ago

Unless the kid is even slightly above average and finds the idea that pi equaling 5 confusing.

[-] NucleusAdumbens@lemmy.world 6 points 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.

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[-] bluewing@lemm.ee 8 points 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.............

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[-] lowleveldata@programming.dev 60 points 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 29 points 1 year ago

Ah, Manhattan. Where pi = 4, and circles are diamonds.

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[-] Kolanaki@yiffit.net 42 points 1 year ago

They're just rounding up from "3."

[-] errer@lemmy.world 20 points 1 year ago

And not that pussy rounding up where you go up by only 1, oh no, we’re rounding up 2 baby.

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[-] downpunxx@fedia.io 27 points 1 year ago

pi, as it turns out, is just the friends we made along the way

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[-] Lemvi@lemmy.sdf.org 27 points 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 30 points 1 year ago
[-] flambonkscious@sh.itjust.works 18 points 1 year ago

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

[-] FlyingSquid@lemmy.world 13 points 1 year ago

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...

[-] elvith@feddit.de 9 points 1 year ago

665.999999657838 the floating point number of the beast

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[-] MadBob@feddit.nl 10 points 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 10 points 1 year ago

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

[-] maynarkh@feddit.nl 8 points 1 year ago

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.

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[-] lugal@lemmy.world 5 points 1 year ago

Maybe e is 5, too?

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[-] Rolando@lemmy.world 26 points 1 year ago

This is how the wealthy calculate their tax exemptions.

[-] JasonDJ@lemmy.zip 9 points 1 year ago

Due to inflation, they now have a bigger pi.

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[-] ThatFembyWho 25 points 1 year ago

Damn inflation is everywhere now, even the transcendentals :'(

[-] RegalPotoo@lemmy.world 19 points 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 17 points 1 year ago
[-] Norgur@fedia.io 7 points 1 year ago

Or have them learn how to use a calculator at the same time.

[-] Serinus@lemmy.world 7 points 1 year ago

Your life is easier and better if you can do this kind of simple math in your head.

[-] Norgur@fedia.io 13 points 1 year ago

Oh don't you try to sell me on the "you won't always have a calculator in your pocket" thing. I have fucking Excel in my pocket.

[-] notabot@lemm.ee 10 points 1 year ago

It's not just about haveing a calculator, it's also that it's faster and more convenient if you can do simple sums like this in your head. It also means you can sanity check the numbers your calculator gives you to make sure you didn't make a mistake entering the sum.

To your point below about products having their unit cost displayed, more than once I've seen that just be wrong, so I wouldn't rely on it. Make sure you can check it in your head.

[-] Serinus@lemmy.world 7 points 1 year ago

Who really wants to use Excel to figure out if the 24-pack of Coca-Cola or the 3 12 packs is a better deal?

[-] Norgur@fedia.io 6 points 1 year ago

I don't need to, there's a legal requirement to print prices per liter or kg on every price tag here.

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[-] bradinutah@thelemmy.club 14 points 1 year ago

"One! Two! FIVE!" "Three, Sire!" "THREE!"

[-] ulterno@lemmy.kde.social 14 points 1 year ago

When you want students to not use calculators but still rate a question for 10 second answer.

[-] visc@lemmy.world 12 points 1 year ago

That just means the curvature of spacetime is negative.

[-] oo1@kbin.social 12 points 1 year ago

Teaching them to to obey dumb instructions from incompetent bosses.
Very useful skill.

Assume the earth is a flat disc . . .

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[-] Got_Bent@lemmy.world 11 points 1 year ago

π = 5 for very small values of r.

[-] simplejack@lemmy.world 9 points 1 year ago
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[-] eugene171@lemmy.world 7 points 1 year ago

My favorite is when doing Order of Magnitude estimations, you are supposed to let pi = 1

[-] FlyingSquid@lemmy.world 7 points 1 year ago
[-] danc4498@lemmy.world 6 points 1 year ago
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[-] gimpchrist@lemmy.world 6 points 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

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[-] Underwaterbob@lemm.ee 5 points 1 year ago

Makes me miss the days of 22/7.

[-] ray@kbin.social 5 points 1 year ago

π = 5 if you round to the nearest 5

[-] HeChomk@lemmy.world 5 points 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.

[-] random_character_a@lemmy.world 5 points 1 year ago

...in spacetime with high curvature?

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this post was submitted on 21 Apr 2024
808 points (100.0% liked)

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