• @jordanlund@lemmy.world
      link
      fedilink
      English
      -57 months ago

      Well, a r=10 and h=10 doesn’t mean much without units. 10 what? Feet? Meters? Inches? CM?

      Let’s take the OG numbers and assume feet, so 5,000 cubic feet. That’s not a useful volume measurement.

      1 cubic foot of water = 7.48052 gallons

      So 5,000 cubic feet of water = 37,402.6 gallons. That’s a viable volume measurement.

      1 cubic meter = 1,000 liters.

      5,000 cubic meters = 5,000,000 liters.

      • @EddoWagt@feddit.nl
        link
        fedilink
        English
        297 months ago

        Well, a r=10 and h=10 doesn’t mean much without units. 10 what? Feet? Meters? Inches? CM?

        Its not supposed to mean anything, it’s about the equation not about the end result. We’re not calculating an actual cilinder

        • Tlaloc_Temporal
          link
          fedilink
          English
          -157 months ago

          If we’re not calculating something useful, then why are we here and not in the library learing about the universe?

          Better question: What curvature of space is necessary for the apparent value of π to be 5?

          • @EddoWagt@feddit.nl
            link
            fedilink
            English
            177 months ago

            If we’re not calculating something useful, then why are we here and not in the library learing about the universe?

            We’re learning maths, which is arguably the foundation of the universe.

            Better question: What curvature of space is necessary for the apparent value of π to be 5?

            I’m afraid that that is beyond the comprehension of my human existence

          • @MinekPo1@lemmy.ml
            link
            fedilink
            English
            2
            edit-2
            7 months ago

            Better question: What curvature of space is necessary for the apparent value of π to be 5?

            ~~honestly I don’t know if there is any way to measure curvature of space , but its slightly more curved than the surface of a ball (where π=4.712)~

            edit : its more complex than that and topology of non euclidean spaces hurts

            • @MBM
              link
              English
              27 months ago

              Kind of curious how you got that value. I think the ratio of circumference to diameter (“pi”) is actually smaller in spherical geometry, in the most extreme case (the equator) it’s just 1. You could say “pi = 5” for circles of a specific radius in hyperbolic geometry, I guess.

              • @MinekPo1@lemmy.ml
                link
                fedilink
                English
                27 months ago

                my mistake was using the sum of angles in a triangle which was kinda dum but whatever . I also tried calculating via the circumstance of a circle placed at a pole where π was 20x smaller for the case I was using but its not linear so I looked deeper which was a big mistake .

                BTW the ratio of circumstance to radius for a circle which is also an equator of the space is ¼ not 1 (r=½π₀ , C=2π₀) .

                • @MBM
                  link
                  English
                  27 months ago

                  BTW the ratio of circumstance to radius for a circle which is also an equator of the space is ¼ not 1 (r=½π₀ , C=2π₀) .

                  I think you mean 4, which makes the ratio of circumference to diameter 2 (either way, no idea how I messed up that one).

      • FuglyDuck
        link
        fedilink
        English
        267 months ago

        The unit is unit.

        The math doesn’t care, and what you’re on about only really matters if the units don’t start as all the same or if you start converting between things.