andromeda Posted September 13, 2008 Report Share Posted September 13, 2008 (edited) Count ALL triangles on this picture! How many of them do you see? Edited September 13, 2008 by andromeda Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 13, 2008 Report Share Posted September 13, 2008 32? 12 base and 20 hiddenish Quote Link to comment Share on other sites More sharing options...
0 dms172 Posted September 13, 2008 Report Share Posted September 13, 2008 34 triangles Quote Link to comment Share on other sites More sharing options...
0 andromeda Posted September 14, 2008 Author Report Share Posted September 14, 2008 I'm not sure! I'll have to count them myself! Quote Link to comment Share on other sites More sharing options...
0 andromeda Posted September 14, 2008 Author Report Share Posted September 14, 2008 32? 12 base and 20 hiddenish I think there are more Quote Link to comment Share on other sites More sharing options...
0 dms172 Posted September 14, 2008 Report Share Posted September 14, 2008 there r only 12 base triangles Quote Link to comment Share on other sites More sharing options...
0 andromeda Posted September 14, 2008 Author Report Share Posted September 14, 2008 34 triangles No! More! Quote Link to comment Share on other sites More sharing options...
0 andromeda Posted September 14, 2008 Author Report Share Posted September 14, 2008 there r only 12 base triangles No! Less! Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 14, 2008 Report Share Posted September 14, 2008 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. Quote Link to comment Share on other sites More sharing options...
0 andromeda Posted September 14, 2008 Author Report Share Posted September 14, 2008 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 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 14, 2008 Report Share Posted September 14, 2008 37 triangles - 11 base and 26 composite? Quote Link to comment Share on other sites More sharing options...
0 andromeda Posted September 14, 2008 Author Report Share Posted September 14, 2008 37 triangles - 11 base and 26 composite? Actually I 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! Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 14, 2008 Report Share Posted September 14, 2008 I found 35 Quote Link to comment Share on other sites More sharing options...
0 andromeda Posted September 14, 2008 Author Report Share Posted September 14, 2008 Actually I To be honest I don't know the correct answer, even though I posted this topic! 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 36 and I think that is the correct number! Quote Link to comment Share on other sites More sharing options...
0 andromeda Posted September 14, 2008 Author Report Share Posted September 14, 2008 Maybe this will help My previous count was incorrect! Quote Link to comment Share on other sites More sharing options...
0 dms172 Posted September 14, 2008 Report Share Posted September 14, 2008 there r only 12 base triangles sry i say that wrong there are only eleven base triangles Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 14, 2008 Report Share Posted September 14, 2008 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? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 14, 2008 Report Share Posted September 14, 2008 Gah...Making my brain hurt...Not to mention the possibility of counting a triangle I've already counted once before. Quote Link to comment Share on other sites More sharing options...
0 andromeda Posted September 14, 2008 Author Report Share Posted September 14, 2008 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 one more with 6 parts!!! 5-6-7-8-10-11 BTW I like your methodology! I started with triangle 1 and listing every possible triangle that contains triangle 1 and so on... Nice job!!! Quote Link to comment Share on other sites More sharing options...
Question
andromeda
Count ALL triangles on this picture!
How many of them do you see?
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