815
Let π = 5 (files.catbox.moe)
submitted 3 weeks ago by [email protected] to c/lemmyshitpost
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[-] [email protected] 103 points 3 weeks ago

Pi is now 5 due to inflation

[-] [email protected] 75 points 3 weeks ago

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

[-] [email protected] 7 points 3 weeks ago

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

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[-] Iron_Lynx 66 points 3 weeks 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 12 points 3 weeks ago

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

[-] NucleusAdumbens 8 points 3 weeks 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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[-] [email protected] 9 points 3 weeks 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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[-] [email protected] 61 points 3 weeks 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

[-] [email protected] 30 points 3 weeks ago

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

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[-] [email protected] 46 points 3 weeks ago

They're just rounding up from "3."

[-] errer 20 points 3 weeks 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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[-] [email protected] 29 points 3 weeks ago

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

[-] Rolando 28 points 3 weeks ago

This is how the wealthy calculate their tax exemptions.

[-] [email protected] 10 points 3 weeks ago

Due to inflation, they now have a bigger pi.

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[-] [email protected] 28 points 3 weeks ago

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

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[-] [email protected] 25 points 3 weeks 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

[-] [email protected] 29 points 3 weeks ago
[-] [email protected] 18 points 3 weeks ago

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

[-] FlyingSquid 13 points 3 weeks 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...

[-] [email protected] 9 points 3 weeks ago

665.999999657838 the floating point number of the beast

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[-] [email protected] 6 points 3 weeks 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.

[-] [email protected] 8 points 3 weeks ago

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

[-] [email protected] 7 points 3 weeks 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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[-] RegalPotoo 18 points 3 weeks 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

[-] [email protected] 18 points 3 weeks ago
[-] [email protected] 7 points 3 weeks ago

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

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[-] [email protected] 15 points 3 weeks ago

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

[-] [email protected] 14 points 3 weeks ago

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

[-] [email protected] 12 points 3 weeks 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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[-] visc 12 points 3 weeks ago

That just means the curvature of spacetime is negative.

[-] Got_Bent 11 points 3 weeks ago

π = 5 for very small values of r.

[-] simplejack 10 points 3 weeks ago
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[-] eugene171 7 points 3 weeks ago

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

[-] FlyingSquid 7 points 3 weeks ago
[-] danc4498 6 points 3 weeks ago
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[-] [email protected] 6 points 3 weeks ago* (last edited 3 weeks 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 = π⋅100⋅10

V = π1000


BONUS SOLUTION:

V =∫~0~^10^ A⋅h dh

A = ∫~0~^10^ 2πr dr

V= ∫~0~^10^ ∫~0~^10^ h⋅2πr dr dh

h is a constant for A's integral so we can safely move it into V's integral

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.

EDIT: Hang on. I'm wrong with that height integral. Can somebody help remind me?

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[-] HeChomk 5 points 3 weeks 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.

[-] [email protected] 5 points 3 weeks ago

Makes me miss the days of 22/7.

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this post was submitted on 21 Apr 2024
815 points (98.0% liked)

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