this post was submitted on 08 Jun 2025
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[–] LovableSidekick@lemmy.world 1 points 1 hour ago* (last edited 1 hour ago)

Lines that intersect a circle like that aren't "right angles" tho, they're called "normal" to the circle - in other words pointing directly toward the center. A normal line is at right angles to a tangent line, but not to a curve.

[–] Saarth@lemmy.world 1 points 2 hours ago

Don't the internal angles need to be 90°? Two of those right angles aren't right angles on the inside.

[–] A_Random_Idiot@lemmy.world 2 points 2 hours ago

Okay, calm down Diogenes

[–] PeriodicallyPedantic@lemmy.ca 19 points 17 hours ago

I'm not a math major, but I always considered it that a square is a special case of rectangle, a rectangle is a special case of parallelogram, and a parallelogram a special case of a quadrilateral, a quadrilateral a special case of a simple polygon.

This shape isn't a polygon, so it cannot be a square.

[–] BuboScandiacus@mander.xyz 8 points 16 hours ago

Not a polygon

[–] hikaru755@lemmy.world 21 points 1 day ago* (last edited 1 day ago)
[–] YiddishMcSquidish@lemmy.today 47 points 1 day ago (3 children)

Oh let's get pedantic!

The curved edges technically have infinite "side".

[–] PeriodicallyPedantic@lemmy.ca 7 points 17 hours ago (1 children)

Hey, that's my job!

Also I don't think that's technically the technical classification. I think that sidedness is an attribute that simply doesnt apply to curves.
You can approximate curves with some number of sides, and the approximation gets more accurate as the number approaches infinity, but it doesn't actually have the infinite sides.

[–] YiddishMcSquidish@lemmy.today 1 points 17 hours ago (1 children)

Very cool! I'm always happy to learn something new!

[–] PeriodicallyPedantic@lemmy.ca 2 points 11 hours ago* (last edited 11 hours ago) (1 children)

I mean, I'm just pedantic; double check with a mathematician, to be sure lol

[–] YiddishMcSquidish@lemmy.today 1 points 10 hours ago (1 children)

I'm genuinely curious, what is your job that requires arithmetic?

[–] PeriodicallyPedantic@lemmy.ca 2 points 10 hours ago (1 children)

I feel like most jobs require arithmetic.
But it is not my career to be a pedant, just my role in life 😜

[–] hansolo@lemmy.today 27 points 1 day ago (3 children)

....and a square has four interior 90 degree angles.

...and based on the infinite number of sides for a curved line aspect, the "90 degree" angles would all be +/- the limit as it approaches zero, so never truly 90 degrees but always an infinite fraction away.

[–] jwmgregory@lemmy.dbzer0.com 2 points 19 hours ago

the angles are interior if you go into the scary world of high level maths and their weird fucking geometries.

this is a square, from a certain point of view

[–] YiddishMcSquidish@lemmy.today 5 points 1 day ago (1 children)

Someone knows more calculus than they are letting on...

[–] hansolo@lemmy.today 4 points 1 day ago (1 children)

Hey, I failed the highest level of calculus possible. Twice.

[–] YiddishMcSquidish@lemmy.today 2 points 17 hours ago

I'll have you know that I passed the two lowest levels of calculus required for my degree. So you know, I'm something of an expert.

[–] olafurp@lemmy.world 4 points 1 day ago (5 children)

Yeah, we gonna need more rigor on this one.

"A square is a shape made up of four equally long lines a, b, c, d where a is perpendicular to c and d and parallel to b. Each of these lines meet exactly two other lines at it's ends."

I'm not a mathematician so there might an odd case somewhere in there. Maybe it has to be confined to a shared plane?

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[–] danhab99@programming.dev 11 points 1 day ago (4 children)

Not if this square is a projection of a curved surface

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[–] Quadhammer@lemmy.world 21 points 1 day ago (1 children)

Rotate the cone towards you.

Now you see this. 🤯

[–] tetris11@feddit.uk 2 points 11 hours ago (1 children)

uhhh, wait. Under what projection is OP's "square" reduced to an actual square

[–] Machinist@lemmy.world 3 points 10 hours ago (1 children)

It's possible, but there needs to be a thickness in addition to the length and width.

[–] tetris11@feddit.uk 1 points 4 hours ago

Im gonna need more than that as an explanation. Sandwiches too if you're making some

[–] taxiiiii@lemmy.world 9 points 1 day ago

Diogenes go home.

[–] joel_feila@lemmy.world 85 points 1 day ago (1 children)

The interior angles need to be equal 🤓

[–] FUsername@feddit.org 1 points 17 hours ago

Here you can see how things go haywire when skipping minor parts of definitions.

[–] throwawayacc0430@sh.itjust.works 16 points 1 day ago* (last edited 1 day ago) (8 children)

Wrong. This is a definition of a [pizza] + [the extra peperoni from the other slices that got stuck to that slice because the cutting was imperfect]

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[–] TheLeadenSea@sh.itjust.works 160 points 2 days ago (11 children)

Straight lines. Also two sets of parallel lines. This is one definition of a square, but not the common one.

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[–] burgersc12@mander.xyz 55 points 1 day ago (29 children)

Does no one understand this is a joke, talking about parallel lines and mathematical proofs is pointless when its a fucking meme

[–] dontbelievethis@sh.itjust.works 36 points 1 day ago (1 children)

It's not pointless because you can laugh about a joke and then learn something about math.

They don't cancel each other out. They can be at the same place and still work on their own.

[–] weird@sub.wetshaving.social 16 points 1 day ago

I love memes that are funny on their own, but also provide discussion material.

Or the fun part.

[–] the_trash_man@lemmy.world 21 points 1 day ago (2 children)

Its wrong though so the joke falls flat

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[–] Kolanaki@pawb.social 6 points 1 day ago (1 children)
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[–] halcyoncmdr@lemmy.world 122 points 2 days ago* (last edited 2 days ago) (1 children)

Someone never had to deal with mathematical proofs, only layman's definitions.

All properties of a parallelogram apply:

  • Opposite sides are parallel
  • Opposite sides are congruent
  • Opposite angles are congruent
  • Consecutive angles are supplementary
  • Diagonals bisect each other

AND

  • All angles are congruent
  • All sides are congruent
  • Diagonals are congruent
  • Diagonals are perpendicular
  • Diagonals bisect opposite angles
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[–] umbrella@lemmy.ml 35 points 1 day ago* (last edited 1 day ago)

ITT: math people going "listen here you little shit"

[–] Pulptastic@midwest.social 39 points 1 day ago (6 children)

A square must also have two pairs of parallel sides.

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[–] JackFrostNCola@aussie.zone 8 points 1 day ago

Tut tut, all these maths books promoting unhealthy square shapes, real squares have curves.

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