- cross-posted to:
- mathmemes@lemmy.blahaj.zone
- cross-posted to:
- mathmemes@lemmy.blahaj.zone
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A Pizza with the radius z and the height a has the volume V= Pi×z×z×a
How do my pineapple chunks factor into the height?
For each piece of pineapple where nea is height of a cone, p is radius of a cone and le equals 1/3, volume is Pi * nea * p * p * le.
You understand now why people don’t like pineaaples on their pizzas?
The only reason people like pineapples in pizza is because they make cum taste better
The only reason people don’t like it is because they haven’t tried it. I was a holdout for the longest time. Fun fact: Hawaiian pizza was invented in Canada by a Greek man.
That must be from a Christian homeschooling textbook
It’s really difficult to calculate circumference when the earth is flat.
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Sorry, I was home schooled. I can only count to three, but I can quote the Bible cover to cover… so that’s a skill.
π ✟ π = 10
The bible says π is 3, so they wouldn’t get it this wrong.
And the Lord spake, saying, '‘First shalt thou take out the Holy Pin. Then shalt thou count to three, no more, no less. Three shall be the number thou shalt count, and the number of the counting shall be three. Four shalt thou not count, neither count thou two, excepting that thou then proceed to three. Five is right out. Once the number three, being the third number, be reached, then lobbest thou thy Holy Hand Grenade of Antioch towards thy foe, who, being naughty in My sight, shall snuff it.’
Unexpected Monty Python
So the answer is Jesus. Y’know, because “he’s the answer to everything?”
So happy to be atheist now …
It’s to make the numbers simple because they aren’t important, the methodology is
I get that, it’s like rounding gravitational acceleration (on earth) to 10…
But why don’t they just use 3, preceded by a “pi is a little more than 3, but for now we’ll round down to 3.”
Especially given that using π=3 is accurate enough for most daily use by ordinary people for ordinary things.
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Just an ordinary person doing ordinary things :)
3 or 5 is equally inaccurate. Engineers usually round it up from however accurate they need it. Scientists usually try to use it to as many digits of significance as they can.
3 or 5 is equally inaccurate, it doesn’t matter which you use if you think that’s accurate. Most people, engineers and scientists and mathematicians, use computers, but you’ll find they can get inaccurate pretty quickly too.
Again, 3 or 5 is a meaningless distinction to round an irrational number to. 3 is not an accurate value of pi in any sense and neither even is 3.14.
I would draw your attention to the difference between mathematics and reality. Although mathematics is extremely useful in modeling reality, it’s important to remember that while all models are wrong, some are nonetheless useful.
Thus, a household gardener or storage tank owner or a builder of small boats can choose the appropriate diameter of hose, tank, or pontoon very effectively by rounding PI to 3 but cannot do so when “rounding” to 1 or 5. In these cases, it literally doesn’t matter how many decimal points you use, because the difference between 3 and any arbitrary decimal expansion of PI will be too small to have concrete meaning in actual use.
Under the philosophy you are promoting, it would be impossible to act in the physical world whenever it throws an irrational number at us.
I don’t know, but I suspect that there is a whole branch of mathematics, engineering, or philosophy that describes what kinds of simplifications and rounding are acceptable when choosing to act in the physical world.
The real world in which we act has a fuzziness about it. I think it’s better to embrace it and find ways to work with that than to argue problems that literally have no numerical solution, at least when those arguments would have the effect of making it impossible to act.
Lol, my philosophy is exactly yours. Allow simplification as necessary, because to do otherwise is a pointless uphill battle. Only use as much accuracy as you really need.
In this case, it doesn’t matter if pi is 3 or 5 or 30. It’s just for teaching purposes. You would need critical thinking to determine how much simplification you can do, which is much better taught by simplifying things differently as you need, rather than just keeping pi as 3 and saying that works everywhere.
I get it now. I was taking exception to your characterization of 3 and 5 being equally inaccurate in the sense of how close they are to the actual true value, which, of course, can never be known, except in every more accurate approximations.
In that case, I guess we still have a difference of opinion. I think that using approximations that are closer to their true value are more useful in teaching, despite (and maybe because of) the greater difficulty. If the student is not yet ready for that level of difficulty, then perhaps a different problem should be presented.
To that end, I actually think that there are several things to teach. That PI is not 3 or 3.14 or any other decimal expansion. That 3 is close enough for most casual encounters outside school. That 3.14 is close enough for most engineering work. That 3.1416 is close enough for most scientific work. That 15 decimal places is close enough for rocket scientists. That 37 decimal places are enough to calculate the circumference of the universe to within the diameter of a hydrogen atom. (https://www.jpl.nasa.gov/edu/news/2016/3/16/how-many-decimals-of-pi-do-we-really-need/ is my reference for the last two items. The others are just wild-ass guesses.)
What I mean is, if you’re using 3, you’re approximating, heavily. If you do anything critical using that value, it’s as bad as using 5 really, imo. Is it really the case that 3 can be used casually? Like in what, workmanship, crafting or something else?
Personally, I would say that pi should be presented as 3.14 and calculators should be used, there’s no reason to fear less than elegant numbers xD. And no, that’s not close enough for most engineering work, as an engineer we don’t usually approximate that much despite the memes, since you have to reduce the margin of error as much as practical. You generally don’t even approximate, just leave it as pi the symbol for the most part since in the end you won’t calculate it manually. The errors stack up the more you use the value. Eg, multiply an inaccurate value of pi by pi and the error you get is exponential.
That aside, I think 5 is more elegant than 3 so if youre approximating to avoid the cumbersome numbers why not go for elegance instead of accuracy? xD
The only thing I can think of is that they wanted the math to be easy, and somehow thought 3 was easier than 5. But, that’s hard to believe because the only other numbers used were all 10s, so it’s 3*10*10*10 vs. 5*10*10*10.
Sure, until you actually need the correct result of the circumference of a circle and think pi is 5.
Misinformation is education. Welcome to the future.
Like, at least make it 3 instead of 5. Still allows for mental math
It’s fucking pi. It’s a constant that will never change in their entire lives, just teach reality the first time instead of making up a thousand little lies to correct later.
thousand little lies
What do you mean there are more than 3 states of matter?
Wait until they start to learn about quantum foam and super fluids.
Gotta cut it off at some point though, right? How many decimals? 10, 4, 1, or 0?
Plus, this is a test not the knowledge delivery. Some thing as ‘assume a flat plane with no friction’ for a physics test. Yeah it’s not 100% accurate but the test taker can be evaluated on the methods
But why 5 and not 4 or 3?
How are you rounding 3.14… to equal 5?
Everything is knowledge delivery if the knowledge is correct. And we already have the decimal cut off, it’s 3.14. You can even find a dozen scientific papers as to why this is specific enough for almost every purpose.
Edit: Also, when it’s mirrored it spells PIE.
And we already have the decimal cut off, it’s 3.14. You can even find a dozen scientific papers as to why this is specific enough for almost every purpose.
But that’s exactly a little lie, in contrast to reality. The truth is, Pi is an irrational number. This means every decimal representation is necessarily wrong, or a “lie”, if you insist. Wether someone deems it accurate “enough” for “almost every purpose” is their opinion. It’s still not the number Pi. If you want to write Pi down in decimal representation, you need to use infinitely many digits. If you use less, you did not write down Pi. Anyone suggesting something else is feeding you a little lie.
The intent of this paragraph was not to encourage you to always fully spell out Pi, but to lead the idea ad absurdum. It should be apparent that there are situations when it is practical, even necessary, to simplify reality to something we can handle.
Science education is full of these situations.
For example, when learning about the composition of atoms, you might first hear about them in the context of Chemistry. And use the Nuclear shell model, which imagines electrons to exist in tidy, circular orbits around the nucleus. Later your teacher might hint at another representation, Atomic orbitals. Later still you might learn about quantum mechanics and describe everything in Wave functions.
Which is reality? While they live in a spectrum from ‘easier to understand’ to ‘more accurate’; Neither! They all are models. They all are human creations. Made by humans, for humans, to talk about reality. They are tools of communication tailored to specific use cases and audiences. Because reality is infinitely complex, but our understanding is always limited.
If you think about it, you will find endless examples like these in your journey how you learned science. We are unable to experience reality as it is, and need to wrap it in language and models. We are also curious at very young ages, and need models and language which is appropriate to our still developing individual capability. We need to embrace these little lies to stand on shoulders of giants.
Anything not objectively true is a lie, anything beyond our best determination is false.
But that does us no good if you can’t work within the context of the necessary framework as knowledge becomes useless as nuance is lost.
https://www.jpl.nasa.gov/edu/news/2016/3/16/how-many-decimals-of-pi-do-we-really-need/
Or just use a cube and say one side is 5 long. Does it really have to be a cylinder?
This is what we get when we cater to the dumbest kids in the class.
The dumbest kids in class can’t handle algebra.
It’s a really bad question for all sorts of reasons. Firstly because they defining π as 5 (it’s not even close to the real value) and they never explain what h is.
Also you should probably just use letters everywhere at this point and not use π unless π equals π.
No child left behind = every child left behind.
I was thinking more it’s Freedom Pi from Florida or Texas or something.
Pretty sure they call that frito-pi in Texas
Sort of. Frito Pie (my grandmother is from Texas and used to make it) is covered with Texas chili.
Ha, oops. I thought this was a response to a conversation about nachos.
So? You think you’ll get the correct result by using 3? Or 3.14? Not quite. You can only get infinitesimally close to the correct result by increasing digits of pi.
And of course, if you really need that circumference for something critical, guess what? You use the things people developed for this very problem, software packages, and so on. And of course, you get it double checked, triple checked.
If it’s assume pi is 5, it’s not misinformation. If they point guns at kids and say it’s 5 for real, then yes.
Or you could just use 3.14 which is infinitesimally more correct than 5, not lie about the number and aim for correctness and accuracy so people learn how to do things right the first time.
If you can’t handle a few decimal points then you aren’t ready for pi, go back to third grade.
I don’t think you understand what infinitesimally means! It means the opposite- you want to use ‘infinitely’ there. Because you’re kinda agreeing with me otherwise xD
Now, not being a condescending asshole, I really take issue with you calling an approximation a ‘lie’. And honestly, who’s multiplying decimal points mentally? That’s difficult. Use a calculator. Want to avoid calculators for an exam? Simplify! That’s why they use 5 and not 3.14.
infinitesimally
I was typing in a rush and mistyped, but you understand what I meant.
Simplify! That’s why they use 5 and not 3.14.
That’s a bullshit excuse. 3 could be argued but 5 is straight disinformation. And I do multiplication of decimals in my head because I was taught how to in school, that’s how far behind the US system is.
That’s impressive. Mental math isn’t one of my talents to be honest. And let’s agree to disagree about the disinformation.
It’s a skill like any other, you have to be taught it to learn it, and you need practice to get better.
Then let’s teach kids to use Wolfram Alpha.
Of course. They already use it like it’s some kind of hack. Make it official. Teach them the ins and outs of Wolfram. Better than memorising and regurgitating information, no?
“One! Two! Five!” “Three sire!” “Three!”
It’s an engineer’s pi.
Added safety tolerance
Not necessarily. Calculating the flotation of a cylindrical pontoon using pi=5 will leave you with a boat that sinks!
So it’s like a baker’s dozen?
It’s called rounding, honey. Look it up
That’s a hell of a rounding 😅
Yep, it’s the secret strategy of rounding to five. Not to a multiple of five, but just five.
60% of the time, it works everytime.
60%5%
In base five it’s fine!
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Not random numbers, just only rounding to five
Indiana at it again. ¹
Well that’s a read and a half. I never expected something like that to happen
Indiana is its own special flavor of stupid.
Thank you for making the link virtually untappable on mobile.
Thank you
How would you regulate such a thing? Or enforce it? Like… people could still use the correct values to achieve a suitable answer.
You would probably begin by having the police break into canneries and tyre factories to beat dents into any round objects they produce, then end up having to concentrate enough mass in neighbouring states to distort spacetime to the point where
π, as measured on a non-Euclidean circle with locally Euclidean constant curvature or radius or something, does in fact equal the number you said it is.
i didn’t choose to be here
At that point just make pi 1 for even easier calculation
Your conditions are nonsensical, therefore the answer must also be nonsensical.
V = A sculpture of Tom Selleck made out of scalloped potatoes.
I would prefer David Hasselhoff made out of hasselback potatoes.
My math teacher back in school blew my mind once with this:
“If you ever get a funny number like 6.28318530717958647 just divide that by π and see if that fixes it. It equals 2, so the answer isn’t 6.283… it’s just 2π and that’s how you should write your answer. Sometimes you get 1.0471975 well guess what? π/3. Simple. Pi isn’t a variable, it is a number and you can just leave it in that form for your answers.”
3142
assume pie is in my belly
“Pi is exactly five!”
Shocked gasps
Haha
Maybe they meant pi is 5r or 0.5r?
