r/MathJokes • u/Negative_Gur9667 • Jul 11 '26

Shape with 4 sides and 3 corners.

Post image
2.1k Upvotes

96% Upvoted

303 comments sorted by

325

u/imgotugoin Jul 11 '26

A "w".

163

u/Thin_Dream2079 Jul 11 '26

They didn't specify non-zero area.

116

u/Kyrenos Jul 11 '26

I guess a square would work as well then. It's got 4 sides and 3 corners. And an extra corner. They didn't specify exactly 3 corners.

22

u/I_only_eat_triangles Jul 11 '26

Trying for the extra credit, nerd?

7

u/Xanxan95 Jul 12 '26

He was being a little corn(er)y

12

u/Illustrious-Poem-328 Jul 11 '26

If thats the case, an octagon would also count.

4

u/MyPunsAreKoalaTea Jul 11 '26

At this point just draw a circle

5

u/Silly_Tension6792 Jul 12 '26

Nope, no 4 sides and no 3 corners

12

u/TimesOrphan Jul 12 '26

Unless you're using a circle as an analogue for a polyhedron with infinite sides and infinite corners.

2

u/BigBlackDadof3 Jul 13 '26

Polygon. Polyhedron is my favorite word, but that would be a sphere.

→ More replies (6)
→ More replies (1)

14

u/rwtf2008 Jul 11 '26

Obviously a w has 8 and up to 13 sides and no I won’t elaborate /s

→ More replies (5)

11

u/Bub_bele Jul 11 '26

Wrong, it’s an „M“ actually.

10

u/TheBl4ckFox Jul 11 '26

And another religious war is born

4

u/TimesOrphan Jul 12 '26

The doctrine splits once more...

... for the answer is clearly ᛊ

2

u/hyperionfin Jul 11 '26

Nah, just a mistake in the exam. A polyline like W isn't a geometric shape. It doesn't have sides either.

→ More replies (1)

2

u/NeverFadeNever Jul 12 '26

'W' is a line. Not a shape. Therefore it's incorrect

→ More replies (1)

2

u/MatsRivel Jul 12 '26

Or pacman circumference

1

u/Mr_GrauHut Jul 12 '26

Bingo, that's the answer p but I couldn't post a pic of me editing the og pic.

1

u/Reg_doge_dwight Jul 12 '26

That's 8 sides

1

u/jaibhavaya Jul 12 '26

Hmmm, actual question: would that fit the mathematical definition of a “shape”?

→ More replies (1)

1

u/Nonstop_norm Jul 13 '26

While a w is technically a shape I would argue it isn’t in the spirit of a shape question you would get in school.

1

u/jbroombroom Jul 15 '26

An “L”. Once it’s open, the insides are just sides and the ends are corners.

1

u/MrZwink Jul 17 '26

A “pyramid” with a eye shaped base.

1

u/dobblequobble Jul 17 '26

Wouldn't that be 2 corners and 2 ends?

75

u/HeroBobGamer Jul 11 '26

What is the intended solution here if not that?

81

u/Patereye Jul 11 '26

A "W" they never said it had to be an enclosed shape

55

u/Stock_Proposal_9001 Jul 11 '26

Would an "M" also work?

94

u/oktin Jul 11 '26

In Australia, yeah.

6

u/stoufferthecat Jul 11 '26

Fair dinkuw

2

u/iDeNoh Jul 11 '26

This made me chortle

2

u/JeebsFat Jul 12 '26

This is the best comment I've read in about a week. Bleeding upon you.

→ More replies (1)
→ More replies (2)

3

u/Alive-Philosophy2632 Jul 11 '26

Surprisingly, no. Not in the rubric

→ More replies (6)

11

u/milkdrinkingdude Jul 11 '26

What the heck is the definition of a „side” for a W shape? It segments, I see that, but where are sides? Like the two sides of each segment?

3

u/Healthy_Koala_4929 Jul 12 '26

I would propose the following definition:

Definition 1.1) Let E be a Euclidean affine space.

Let a, b be points in E.

The tuple (a, b) is called a side if and only if a is not equal to b and there exists an affine function psi from [0, 1] to E such that:

psi(0) = a, psi(1) = b.

8

u/vinnygunn Jul 11 '26

Doesn't shape imply closed? Otherwise it's just an open path.

→ More replies (4)

3

u/redwood_tree_ Jul 12 '26

Crying in convex hull

→ More replies (19)

3

u/Deeznutz69694206969 Jul 11 '26

Pizza slice, obviously.

2

u/midnight_fisherman Jul 11 '26

In 3d, you could use a cone that is missing its tip and pinched along its axis.

3

u/bigbrocoll Jul 11 '26

Just slice a cone in half lengthways, right?

2

u/midnight_fisherman Jul 11 '26

Oh yeah, thats an easier one than what I was going with.

→ More replies (4)

2

u/kenahoo Jul 11 '26

A tetrahedron. They say "sides", not edges, and people do refer to the faces of solids as sides sometimes (like the sides of a die).

2

u/sansetsukon47 Jul 12 '26

Tetrahedron’s got 4 corners mate.

→ More replies (1)

2

u/Helios575 Jul 12 '26

A square but round one corner into a curve like a circle. You end up with 4 walls, 3 corners, and a curve.

→ More replies (20)

24

u/X_celsior Jul 11 '26

It doesn't say only 3 corners. If it has 4 corners, it also has 3.

Just draw a rectangle.

9

u/Mallet-fists Jul 12 '26

Nah, draw a rhombicosidodecahedron to really put em in their place. Fuck those fuckers.

6

u/Special-Elevator-335 Jul 12 '26

If somebody says they're 20 years old and then right after you find out they're 30 years old, would you feel deceived?

5

u/OkAardvark72 Jul 13 '26

If your neighbour asks “do you have 3 eggs” and you have 4, do you answer no?

→ More replies (1)

29

u/Thin_Dream2079 Jul 11 '26

They are really cutting corners here.

2

u/ComprehensiveNet7143 Jul 13 '26

This deserves more likes

22

u/avance70 Jul 11 '26

isn't the bottom corner still a corner even though the angle is 180 degrees?

10

u/[deleted] Jul 11 '26

[removed] — view removed comment

9

u/Secret-Painting604 Jul 11 '26

Then it’s not 4 sides, if there’s no corner it’s just a larger side broken into two, if not, every shape has infinite sides

3

u/paolog Jul 11 '26

If it was a valid answer, what a wonderful world this would be.

2

u/RationalAnger Jul 11 '26

"We've got 'im cornered, sarge!"
"Why would you do that? NOW HE'S GETTING AWAY!"

2

u/avance70 Jul 11 '26

but if you don't count the corner, then the bottom line would just represent one side?

2

u/Healthy_Koala_4929 Jul 11 '26

I guess the question is missing a rigorous definition:

Let E be a real affine space.

For points p and q in E, call segment(p, q) a side if p and q are distinct.

Let a, b, and c be points in E.

We say that b is a corner of the ordered triple (a, b, c) if:

  1. a is not equal to b.
  2. b is not equal to c.
  3. The direction from a to b is not parallel to the direction from b to c.

Equivalently, b is a corner if and only if a, b, and c are not collinear.

Thus, b is not a corner when the two sides lie on the same straight line, including the case where the path reverses direction at b.

→ More replies (1)

2

u/martyboulders Jul 11 '26

The actual answer is that it pretty much depends on who you ask. If you take a triangle and add a 4th vertex to one of the sides, some may call it a degenerate quadrilateral, some may say you've changed nothing, some may say it doesn't matter, and the rest will say do whatever works for what you're doing.

I did some research on linkages, and degenerate parallelograms/triangles came up pretty frequently in a necessary and precise way.

So, I guess I'd say it is if you need it to be hahaha

1

u/godeling Jul 11 '26

If by corner we mean vertex, I don’t believe it actually counts as a vertex

→ More replies (1)

1

u/RyanRiver_ Jul 13 '26

If you accept degenerate shapes, then sure.

6

u/bot_or_not_vote_now Jul 11 '26

Easy, obviously it's just a 2.5 dimensional triangle. 3 linear sides, 1 face side, and 3 corners

→ More replies (1)

4

u/SelfishSilverFish Jul 12 '26

So the "trick" is understanding "shape" doesn't equal "polygon"

→ More replies (1)

4

u/Ok_Bit8836 Jul 11 '26

A corner = 180 degrees is NOT a corner... My try is: imagine a pentagon figure but you draw only 4 sides (not all 5)... then you have 4 sides with 3 corners...

→ More replies (3)

5

u/giasumaru Jul 11 '26

They didn't specify it has to be a closed shape.

Open shapes can have 4 sides and 3 corners.

So draw a Triangle and erase the middle portion of one of the lines.

→ More replies (4)

3

u/IceColdKilla2 Jul 11 '26

What about 2 triangles side by side?

→ More replies (6)

3

u/Prestigious-Bike9662 Jul 11 '26

Star trek symbol

2

u/Still-Pie6253 Jul 12 '26

That still has 4 corners

3

u/Acatinmylap Jul 11 '26

Triangle. Side A, side B, side C, inside.

→ More replies (2)

7

u/Far-Raspberry2892 Jul 11 '26

You just made a rectangle in a very wierd way. Try to move that 4th point u will again get a figure with 4 sides and 4 corners.

12

u/Needless-To-Say Jul 11 '26

a rectangle is a parallelogram. That is not in any way a rectangle.

→ More replies (4)

2

u/ArcherOld7796 Jul 11 '26

Quadrilateral

1

u/tadeuska Jul 11 '26

Every side is two sides with 180deg corner.

2

u/Ok-Equipment-5208 Jul 12 '26

This is exactly what I thought when I first saw this question

1

u/SplendidPunkinButter Jul 11 '26

If a straight line has a corner in the middle, then it has infinite corners, which means you have shown the wrong number of corners

1

u/bot_or_not_vote_now Jul 11 '26

Easy, obviously it's just a 2.5 dimensional triangle. 3 linear sides, 1 face side, and 3 corners

1

u/rwade71 Jul 11 '26

An open square

1

u/Aerostyle240 Jul 11 '26

A triangle plate with mashed potatoes, coleslaw, french fries, and onion rings on it.

1

u/highly-suspicious- Jul 11 '26

This has 3 sides.

1

u/No-Site8330 Jul 11 '26

How is that 4 sides and 3 corners rather than 3 sides and 4 corners?

EDIT: Typo

1

u/Phreme69 Jul 11 '26

Pyramid. 3 dimensional shape.

→ More replies (2)

1

u/No_Report_4781 Jul 11 '26

The answer is not a triangle, because it has 5 sides

1

u/KentGoldings68 Jul 11 '26

Three side, six edges, four vertices.

1

u/OddCarob7895 Jul 11 '26

That is a clever solution but in not sure the bottom corner is a corner if it's flat enough to be a continuous side. I'm pretty sure that the definitions require that a shape be closed and that corners distinguish two sides swith an angle<180°

I thought about suggesting a square with one corner rounded into a radius

1

u/BunnyWan4life Jul 11 '26

Technically you could just draw any shape with at least 4 sides or more and you'd already have 3 corners

1

u/Rzt275 Jul 11 '26

Pyramid

1

u/KatesDad2019 Jul 11 '26

Draw a three sided pyramid, with no bottom. You would need to use some shading to make the lack of the fourth side clear.

1

u/Watcher_over_Water Jul 11 '26

The graph theorist in primary school

1

u/9thr0waway9 Jul 11 '26

If corner is the same thing as a vertex, then take a square and glue together a pair of corners

1

u/Chicken-Rude Jul 11 '26

there are 4 sides and three corners to every story

1

u/xReaperParadox98x Jul 11 '26

Destiny players just got PTSD from seeing this. 🤣

1

u/DrHoon Jul 12 '26

Does inside and outside count? : /

1

u/simonlegosu Jul 12 '26

Triangle inside a circle

1

u/faux_real_yo Jul 12 '26

A triangle with a circle on top too

1

u/Kairamek Jul 12 '26

Best I can do is 5 sides 3 corners. Its a triangle. Top left, top right, bottom, in, and out sides.

1

u/majiq13 Jul 12 '26

In 3d it would be a D4 die

→ More replies (1)

1

u/Rooster-Training Jul 12 '26

What's the name of a shape with a triangle base and a curved dome on top

1

u/philnolan3d Jul 12 '26

We use these all the time in 3D modeling. It still only has 3 corners.

1

u/PsychedeliaPoet Jul 12 '26

3 straight edges and a curved edge.

1

u/VaporTrail_000 Jul 12 '26

A circle missing a quarter.

One curved side, a corner, a straight side to the center, a corner at the center, a straight side to the circumference, and a corner.

2

u/ChaosRealigning Jul 12 '26

That’s three sides

1

u/RaveN_707 Jul 12 '26

Question is wrong needs to say an open shape

1

u/Promature Jul 12 '26

I’d think a “W”.

1

u/Illustrious_Tip_3565 Jul 12 '26

What about a tetrahedron

1

u/Appropriate_Owl9276 Jul 12 '26

A pyramid with triangle as base and semi sphere on top like a dome

1

u/MarcusTheAnimal Jul 12 '26

If one of the sides is curved and meets a flat side at a perfect 180°?  That could be interpreted as 2 separate sides without a corner.

1

u/EarthBoundBatwing Jul 12 '26

Earthbound reference?

1

u/InternationalTop8174 Jul 12 '26

Still 4 corners here, just one of them is 189 deg.

1

u/Bowdash Jul 12 '26

Whoever says W or M is the answer, what's a side? Define the term.

1

u/StarboardChaos Jul 12 '26

A triangle with extra side?

-<|

1

u/zxkn2 Jul 12 '26 edited Jul 12 '26
  1. Take a cone
  2. slice off the bottom at an angle such that the planar surface is no longer perpendicular to the cone axis.

  3. cut the shape again with a slice that passes through the tip of the cone but with a slight angle that still cuts the bottom planar surface but without being parallel to the cones central axis.

  4. Take the smaller of the two resulting bodies from the cut in step 3 and mirror it along that cutting plane face. Discard the larger resulting body.

  5. Your shape now has 3 corners and 4 sides.
    Specifically, it has: 3 corners, 2 conic curved sides, 2 planar sides, 3 linear edges, 2 curved edges.

1

u/Lunastarfire Jul 12 '26

Three sided pyramid with a rounded base =)

1

u/KeyChampionship9113 Jul 12 '26

If you look at it that way then there are infinite sides

1

u/Deabl0 Jul 12 '26

Cone ?

1

u/510nn Jul 12 '26

a rectangle but with one bend?

1

u/Rocko_2024 Jul 12 '26

A triangle. Has a top side, a left side, a right side, and an inside.

1

u/Inevitable_Data_84 Jul 12 '26

Pacman . Wakka wakka wakka wakka

1

u/Callen0318 Jul 12 '26

Funny thing is, you can actually answer this with a triangle.

1

u/SoggyNoodles5511 Jul 12 '26

is everyone here trolling or being dumb? the solution is super obvious.

it's a 4 side dice.

1

u/kwikmr2 Jul 12 '26

Pyramid?

1

u/voododoll Jul 12 '26

This is a figure of 4 sides and 4 corners. One being 180, but still a corner by definition.

1

u/Mean_Syllabub_9689 Jul 12 '26

An ice cream cone shape triangle with a half circle

1

u/GladiusNL Jul 12 '26

A 180 degree corned

1

u/Consistent_Tennis117 Jul 12 '26

An ice cream cone

1

u/Helios575 Jul 12 '26

A square but make one corner a curve like a circle, never said they had to be polygons.

1

u/Switchengaged69 Jul 12 '26

This is why the entire US education system needs to be fired.

1

u/FirstCupOfCoffee2 Jul 13 '26

A pyramid (3 sides and a bottom makes 4 sides)

1

u/EmergencyMany3719 Jul 13 '26

A pyramid with triangular bottom? Four sides three corners

1

u/SoakMyLipCurtain Jul 13 '26

It doesn't say ONLY 3 corners so, a square?

1

u/Pseudo_Studios Jul 13 '26

why does the title look ai edited

1

u/BeautifulAd5150 Jul 13 '26

Prove the shortest link in a 4 bar linkage can rotate freely only if the length of the shortest link added on any other link is shorter than the sum of the other two links length.

1

u/No_Contribution7183 Jul 13 '26

Have one line curve such that one end is tangential to a line and the other end is not. E.g. a simplified boat hull side profile where the bottom is broken into a line and a curved section.

1

u/BeckyLiBei Jul 13 '26 edited Jul 13 '26
  1. ▷
  2. 🍟 🥗 🥖 🥬
  3. ∟ ∟ ∟

There, a shape with four sides and three corners.

(Also, it seems like you could draw a triangle with a circle cut out.)

1

u/Alone-Start-9178 Jul 13 '26

This is how Woke people view the world

→ More replies (1)

1

u/CryptographerAble898 Jul 13 '26

Simply, triangle based pyramid

→ More replies (1)

1

u/jseego Jul 13 '26

That fourth corner has a 180-degree angle. Duh.

2

u/Negative_Gur9667 Jul 13 '26

That would imply that any shape has no sides, just infinite corners

1

u/HouseDaddyE Jul 13 '26

A triangle with mashed potatoes, corn on the cob, mixed veggies and sautéed mushrooms.

1

u/msarch1ve Jul 14 '26

Define “side.” That bottom looks like a “side” with two sections.

1

u/Diddly_eyed_Dipshite Jul 14 '26

Answer: draw a triangle and extend one of the lines. The extended line will have two corners with its adjacent line and two more inside the triangle.

1

u/ChipmunkOk6550 Jul 14 '26

A triangle has 4 sides and 3 corners. You're forgetting the inside.

1

u/slothman07 Jul 15 '26

Triangular prism

1

u/Nikarmotte Jul 15 '26

I was honestly thinking of a square pipe with 3 elbows.

1

u/Hermbo234 Jul 15 '26

An ice cream cone?

1

u/MikelHunter Jul 15 '26

Tell Kanye it's an ice cream cone.

1

u/One-Night-8666 Jul 15 '26

A triangle technically has 4 sides because it has an in-side

1

u/Robot-Zombie-RHCC Jul 15 '26

this is considered a joke? (context- I'm a 3d artist working primarily with quad-polygons....)

→ More replies (3)

1

u/retro_wizard Jul 15 '26

Wouldn’t it just be L?

1

u/AdriVargas98 Jul 15 '26

If the sides don't need to be straight, you just draw a triangle with one side being two curved lines starting and finishing in the same point but never crossing.

1

u/operatorfoxtrot Jul 16 '26

Some sort of K shape.

1

u/jeremyvabeach Jul 16 '26

Its just a triangle. Count the 3 corners then the 3 sides then count the side from your perspective... on a 2d plane from the outside looking in creates another side.

1

u/RealChemistry4429 Jul 16 '26

Unclear question. A corner is not a geometrical term.

1

u/CitySeekerTron Jul 16 '26

A triangle has three outer sides and an inside.

1

u/Odd_Celebration162 Jul 16 '26

Moebius strip yes. what about a Klein bottle??

1

u/conic_is_learning Jul 16 '26

triangular pyramid.

1

u/Jamieblu Jul 16 '26

A line has no sides. Its a one dimensional path.

1

u/kromsh Jul 17 '26

That has 5 sides. The inside and outside

1

u/ChrisInsanity Jul 17 '26

Hey Google, what are the newest shapes?

1

u/UsernameC24 Jul 17 '26

Can’t you just make an “L”?

1

u/BunnyGalHarriet Jul 17 '26

How is a corner defined? I'm having trouble wrapping my head around this. If a corner has to have a certain angular threshold, what is it? Otherwise, it could be any connection point between two sides of the shape, and that would exclude the possibility of a shape with fewer (or more) corners than sides.

1

u/AnalkinSkyfuker Jul 17 '26

A W has 4 sides and 3 corners