[andromeda]

Count ALL triangles on this picture!

How many of them do you see?

Edited September 13, 2008 by andromeda

[Guest]

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32? 12 base and 20 hiddenish

[dms172]

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34 triangles

[andromeda]

I'm not sure!

I'll have to count them myself!

[andromeda]

  beckie-x said:

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32? 12 base and 20 hiddenish

I think

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there are more

[dms172]

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there r only 12 base triangles

[andromeda]

  dms172 said:

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34 triangles

No! More!

[andromeda]

  dms172 said:

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there r only 12 base triangles

No! Less!

[Guest]

A puzzling geometric illusion

This sprouts up the weed of pure confusion

How many triangles found in the square?

The answer can not be found anywhere.

My mind doesn't want to count and number

It would be more soothing to fall into slumber.

[andromeda]

  frozen_in_fire said:

A puzzling geometric illusion

This sprouts up the weed of pure confusion

How many triangles found in the square?

The answer can not be found anywhere.

My mind doesn't want to count and number

It would be more soothing to fall into slumber.

HA HA!

Nice

[Guest]

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37 triangles - 11 base and 26 composite?

[andromeda]

  = W = said:

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37 triangles - 11 base and 26 composite?

Actually I

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35! I added a number to each section (13 sections; 11 base triangles)and counted the composite triangles and it was 35.

To be honest I don't know the correct answer, even though I posted this topic!

[Guest]

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I found 35

[andromeda]

  andromeda said:

Actually I

To be honest I don't know the correct answer, even though I posted this topic!

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35! I added a number to each section (13 sections; 11 base triangles)and counted the composite triangles and it was 35.

OK! After recounting them

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36 and I think that is the correct number!

[andromeda]

Maybe this will help

My previous count was incorrect!

[dms172]

  dms172 said:

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there r only 12 base triangles

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sry i say that wrong there are only eleven base triangles

[Guest]

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Here are my 26 composite triangles

2 parts (11) : 1-6, 2-3, 2-7, 3-8, 4-5, 4-9, 6-7, 7-8, 10-11, 11-13, 12-13

3 parts (5) : 1-2-3, 6-7-8, 7-8-11, 9-10-11, 9-10-12

4 parts (4) : 1-4-5-6, 2-3-7-8, 5-6-7-8, 7-8-11-13

5 parts (3): 2-3-7-8-11, 4-5-6-7-8, 9-10-11-12-13

6 parts (1) : 2-3-7-8-11-13

7 parts (1) : 1-4-5-6-9-10-12

8 parts (1) : 1-2-3-4-5-6-7-8

together with 11 base triangles it must be 37?

[Guest]

Gah...Making my brain hurt...Not to mention the possibility of counting a triangle I've already counted once before.

[andromeda]

  = W = said:

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Here are my 26 composite triangles

2 parts (11) : 1-6, 2-3, 2-7, 3-8, 4-5, 4-9, 6-7, 7-8, 10-11, 11-13, 12-13

3 parts (5) : 1-2-3, 6-7-8, 7-8-11, 9-10-11, 9-10-12

4 parts (4) : 1-4-5-6, 2-3-7-8, 5-6-7-8, 7-8-11-13

5 parts (3): 2-3-7-8-11, 4-5-6-7-8, 9-10-11-12-13

6 parts (1) : 2-3-7-8-11-13

7 parts (1) : 1-4-5-6-9-10-12

8 parts (1) : 1-2-3-4-5-6-7-8

together with 11 base triangles it must be 37?

Uuuuuu... so close but not quite, you still have

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one more with 6 parts!!!

5-6-7-8-10-11

BTW

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I like your methodology! I started with triangle 1 and listing every possible triangle that contains triangle 1 and so on...

Nice job!!!