Hi,

How many triangles are in this picture:

Attachment 20537

Kind regards,

Kepler

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- Jan 21st 2011, 01:20 PMkeplerHow many triangles?
Hi,

How many triangles are in this picture:

Attachment 20537

Kind regards,

Kepler - Jan 21st 2011, 02:02 PMundefined
- Jan 21st 2011, 02:10 PMkepler
Hi,

yep, that's my guess too.

Kind regards,

Kepler - Jan 21st 2011, 03:45 PMArchie Meade
Counting sequentially......

If there are no internal lines, 1 triangle.

Draw the vertical line, 2 new triangles.

Draw the line from the left vertex to the right side, 5 new triangles.

Draw the line from the right vertex to the left side, 6 new triangles.

Draw the line from the left side to the mid-base, 7 new triangles.

Draw the line from the right side to the mid-base, 7 new triangles.

Total 28. - Feb 12th 2011, 11:56 AMbeeliz
I found 34 triangles (Wink)

picture of them: Attachment 20770 - Feb 12th 2011, 12:51 PMArchie Meade
Well done!

I miscounted.

My totals should have been....

No internal lines.....1 triangle

1 internal line........2 more

3 lines..................5 more

4 lines..................8 more

5 lines..................8 more

6 lines..................10 more - Feb 12th 2011, 02:44 PMtom@ballooncalculus
- Feb 12th 2011, 04:06 PMArchie Meade
Here's another counting process

- Feb 13th 2011, 01:09 PMbeeliz
whoooops. well I found 34 somewhere... (Thinking)

oh in the image Archie Meade posted, it's #2 in the fourth triangle and #1 in the sixth triangle that I missed in my picture. but I found them the first time I counted during a boring english class (Smile)

better picture: Attachment 20791 because I'm a perfectionist (Wink)