• KubeRoot@discuss.tchncs.de
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      7 months ago

      Doesn’t curvature cause pi to not be a constant? And wouldn’t it be negative curvature that would cause it to be higher than euclidean space?

  • lowleveldata@programming.dev
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    7 months 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

  • RegalPotoo@lemmy.world
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    7 months 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

          • Norgur@fedia.io
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            7 months 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
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              7 months 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
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              7 months 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
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                7 months ago

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

                • HopFlop@discuss.tchncs.de
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                  7 months ago

                  But if you want to buy only half a kg, you don’t know how much it costs (if you dont know basic maths)- because it only lists the price for a full kg. Do you start pulling out your Excel for that?

                • Gork@lemm.eeOP
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                  7 months ago

                  Does this requirement exist for toilet paper? Because I don’t know what the hell is considered a better deal based on all the marketing.

  • FiniteBanjo@lemmy.today
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    7 months 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 = πr2h

    V = π⋅102⋅10

    V = π⋅100⋅10

    V = π1000


    BONUS SOLUTION:

    V =∫010 A⋅h dh

    A = ∫010 2πr dr

    V= ∫010010 h⋅2πr dr dh

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

    V= ∫010 h⋅∫010 2πr dr dh

    π is a constant so we can safely remove it from A’s integral

    A = π⋅∫010 2r dr

    A = π⋅[r2]010

    A = π⋅( [102] - [02] )

    A = π102

    A = π100

    V = ∫010 h⋅π100 dh

    π100 is a constant so we can safely remove it from V’s integral

    V = π100⋅∫010 h dh

    V = π100⋅[h]010

    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?

    • benignintervention@lemmy.world
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      7 months ago

      If you really wanted to be through you’d start at a point, integrate out along dr for a line, then integrate in a circle through dtheta to derive the area before doing the rest

  • SloppySol@lemm.ee
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    7 months ago

    Numbers are symbolic, I’d say it’s not a bad piece of homework 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@lemmy.world
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      7 months ago

      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@lemmy.world
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        7 months ago

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