this post was submitted on 15 May 2025
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[–] Mistic@lemmy.world 10 points 3 weeks ago* (last edited 3 weeks ago) (2 children)

Equal sides in a triangle are only possible if the corners are equal. So, 60⁰ each.

But its height cannot be half of base because of the same Pythagorean theorem

(1,5)²+(1,5/2)²=2,8125

sqrt(2,8125) ≈ 1,677, which is half of a diagonal

So, we get 4 sides that are 1,5 in a parallelogram, but diagonals are 1,5 and 3,354, as opposed to both being 1,5 as shown on the picture

TL;DR: Won't work because Pythagorean theorem

[–] Obi@sopuli.xyz 4 points 3 weeks ago (2 children)

It's funny how we say "because of such and such theorem" as if if some greek dude didn't come up with his little story, the height could totally be half of base.

[–] bss03@infosec.pub 2 points 3 weeks ago

Decolonialize Maths!

We do need short names, but they don't all have to be wyt guys. Pre-globalization, I'm sure many true maths statements were independently discovered by many people.

[–] rowinxavier@lemmy.world 3 points 3 weeks ago (2 children)
[–] kryptonianCodeMonkey@lemmy.world 3 points 3 weeks ago (1 children)

Yes, it is possible with a 3-sided pyramid, i.e. tetrahedron. If we dont look at all 4 points as being on the same plane but 2 opposite corners being offset above or below the other two, this could totally be a tatrahedron.

[–] ptu@lemm.ee 1 points 3 weeks ago

So those two darker green symbols would represent someone shorter or taller. Totally plausible.

[–] Mistic@lemmy.world 1 points 3 weeks ago (1 children)
[–] TheButter_ItSeeps@lemmy.world 8 points 3 weeks ago (2 children)

They could each be on the vertices of a tetrahedron for all we know...

[–] bss03@infosec.pub 3 points 3 weeks ago (1 children)

We do know that, with those measurements, they aren't confined to a single (Euclidean) plane.

[–] LovableSidekick@lemmy.world 2 points 3 weeks ago* (last edited 3 weeks ago)

Exactly! I regret that I have but one upvote to give.

[–] Mistic@lemmy.world 2 points 3 weeks ago

I was thinking of plane surfaces, but if their altitudes are different, I guess it'd be possible.