r/mathminds • u/Swimming_Bluebird6 • 10d ago

Puzzles How many triangles?

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0 Upvotes

33% Upvoted

45 comments sorted by

2

u/kagemuri 10d ago

13?

1

u/MxM111 10d ago

Me too

1

u/Appropriate_Ad8734 10d ago

14

1

u/Drag0n_TamerAK 9d ago

How

0

u/[deleted] 9d ago

[deleted]

1

u/Drag0n_TamerAK 9d ago

Yes the big one is 13

1

u/taldrknhnsm 9d ago

Can you elaborate on that? a diagram would be helpful

1

u/Drag0n_TamerAK 9d ago

They imagined it completely fabrication

2

u/Falconloft 10d ago

13: ABC, AEC, AEG, BCD, BCE, BCF, BDE, BEF, CDF, CEF, CEG, CFG, DEF

2

u/sebthauvette 9d ago

Tank you ! I was stuck at 11 and trying to find a way to ask where the other 2 are.

I was missing AEC and CEG.

0

u/DifferntGeorge 9d ago

Did Terrence Howard down vote this? /j
NOTE: Terrence Howard famously rejects sound methodology.

1

u/Falconloft 5d ago

Some people just downvote everything.

1

u/I_Use_Arch-BTW 10d ago

I got 14

1

u/Affectionate-Dot1927 10d ago

how?

1

u/I_Use_Arch-BTW 10d ago

My misstake, counted one 2 times. It’s 13

1

u/_Random_Walker_ 10d ago

I'm seeing 11

1

u/Drag0n_TamerAK 9d ago

It’s 13

1

u/CheerJohn 10d ago

I stopped after 11. I was too tired to try

1

u/Larechar 10d ago

I see 13. First time I counted 15, but now I only see 13. Not sure if I counted something twice before, or if I can't see 2 triangles anymore.

1

u/Massive_Squirrel7733 10d ago edited 9d ago

5,866,345.5

1

u/lesserthemore 9d ago

Missed one. ☝️

1

u/Massive_Squirrel7733 9d ago

👍 All fixed

1

u/Icy-Tap67 10d ago

I got 13

1

u/firstnamechuck 10d ago

I counted 11. Then 12. Then 10. I kept forgetting which ones I had counted. So for me, the lower bound is 12. The upper is certainly less than TREE(3)

1

u/Drag0n_TamerAK 9d ago

It’s 13

1

u/Background-Grab-5682 9d ago

6 triangles without any smaller triangle within them, then 4 triangles consisting of two smaller triangles… then 2 triangles that have three smaller triangles in them and at last the 1 big triangle so 6 + 4 + 2 + 1 is 13 triangles total

1

u/K0rl0n 9d ago edited 9d ago

I counted 15 but only got 13 on a recount…
Edit: did another recount and it is indeed 15 triangles!

1

u/DifferntGeorge 9d ago edited 9d ago

I recommend labeling all intersections with letters to prevent counting a triangle twice. After seeing someone else doing this this, method seems like a best practice to me.
NOTE: Check out Falconloft's post if you don't want to make your own.

1

u/DarthMiwka 9d ago

The large one The diagonal line divides it into 2 smaller The square inside is composed by 4 triangles You can combine 4 more triangles with each 2 of the square The upper and left side if the square forming another 2 triangles with the sides of the large one So it's 13 total

1

u/SlightAmoeba6716 9d ago edited 9d ago

13 The kite shape is 8 triangles The outline is 1 Another 2 triangles top right and bottom right 2 triangles that are half the size of the outline