• TheOakTree@lemm.ee
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      1 year ago

      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.”

      • jadero@mander.xyz
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        1 year ago

        Especially given that using π=3 is accurate enough for most daily use by ordinary people for ordinary things.

        • F4lcon@discuss.tchncs.de
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          1 year ago

          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.

          • jadero@mander.xyz
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            1 year ago

            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.

            • F4lcon@discuss.tchncs.de
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              1 year ago

              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.

              • jadero@mander.xyz
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                1 year ago

                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.)

                • F4lcon@discuss.tchncs.de
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                  1 year ago

                  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

                  • jadero@mander.xyz
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                    1 year ago

                    When I’m figuring the buoyancy of a 20 litre pail or, alternatively, how much it’ll weigh when filled with sand, 3 is easier to work in my head for off-the-cuff estimates so I know about how many pails I need.

                    That said, I do typically use the π button on my calculator when it comes time to actually execute on the project. :)

      • merc@sh.itjust.works
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        1 year ago

        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.

    • LemmysMum@lemmy.world
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      1 year ago

      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.

      • aesopjah@lemm.ee
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        1 year ago

        Like, at least make it 3 instead of 5. Still allows for mental math

        • LemmysMum@lemmy.world
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          1 year ago

          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.

          • aesopjah@lemm.ee
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            1 year ago

            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

            • LemmysMum@lemmy.world
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              1 year ago

              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.

              • Spzi@lemm.ee
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                1 year ago

                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.

                5 Lies You Were Told in School (SciShow)

                  • Spzi@lemm.ee
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                    1 year ago

                    It has some irony that someone is arguing for an inaccurate value of Pi in a meme post which is all about Pi being used inaccurately, while complaining about “little lies”.

                    If you want to talk about this opinion piece: Rayman himself says they are using many more digits, because two digits is not enough. Pi is also used in many more fields than astronomy. So to assume “all we ever need is two digits of Pi” because astronomers consider that to be enough “for most calculations” seems a bit short-sighted.

                    For example, if you repeatedly multiply a value by something with Pi, over many million iterations, you absolutely want more accuracy. The example given in the article is very specific. It’s a nice insight, but no basis for generalization.

                    In the end, if you insist this simplification is sufficient, you’re making the very point I was making: Sometimes, we don’t need the full complexity of reality, but “a little lie” is fully sufficient and much easier to understand and deal with. However, students should understand that’s not the full story, probably never will be.

        • hansl@lemmy.world
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          1 year ago

          Or just use a cube and say one side is 5 long. Does it really have to be a cylinder?

        • Echo Dot@feddit.uk
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          1 year ago

          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.

            • zeppo@lemmy.world
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              1 year ago

              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.

      • F4lcon@discuss.tchncs.de
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        1 year ago

        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.

        • LemmysMum@lemmy.world
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          1 year ago

          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.

          • F4lcon@discuss.tchncs.de
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            1 year ago

            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.

            • LemmysMum@lemmy.world
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              1 year ago

              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.

              • F4lcon@discuss.tchncs.de
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                1 year ago

                That’s impressive. Mental math isn’t one of my talents to be honest. And let’s agree to disagree about the disinformation.

                • LemmysMum@lemmy.world
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                  1 year ago

                  It’s a skill like any other, you have to be taught it to learn it, and you need practice to get better.

      • F4lcon@discuss.tchncs.de
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        1 year ago

        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?