this post was submitted on 09 Jun 2025
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Greentext

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First day of fifth grade (cdn.imgchest.com)
submitted 18 hours ago* (last edited 18 hours ago) by [email protected] to c/[email protected]
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[–] [email protected] 70 points 17 hours ago (19 children)

Important distinction: A triangle is a three-sided polygon. For example, a quarter-circle is not a triangle, despite being a three-sided shape.

[–] [email protected] 6 points 15 hours ago (12 children)

They should have included something about the count of angles in the name

[–] [email protected] 6 points 14 hours ago (1 children)

A quarter circle still has three angles. I am pretty sure about this. Now that I think of it, I think it has three 90° angles, which is kinda sus.

[–] [email protected] 2 points 14 hours ago (1 children)

The curved part has infinite angles

[–] [email protected] 7 points 14 hours ago (1 children)

If you want to go that way, the straight parts have infinite angles too.

[–] [email protected] -1 points 14 hours ago (2 children)
[–] [email protected] 4 points 10 hours ago

Those angles are just 180° (:

[–] [email protected] 3 points 13 hours ago (1 children)

They're just arcs from an infinite radius circle.

[–] [email protected] 1 points 13 hours ago (2 children)

Is it even mathematically legal to allow impossible shapes into this type of dilemma?

[–] [email protected] 3 points 9 hours ago

believe it or not, straight to math jail

[–] [email protected] 0 points 12 hours ago (1 children)

In 5D conformal geometric algebra G (4,1), a sphere can contain a point at infinity, and therefore represents a flat plane.

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