Between all the beauties, the warrior-lords and the dragons you could
easily miss the seven-star of the Game of thrones. It resembles the seven
gods of their belief and appears on flags and decorations but it is also a very
nice triangle-counting riddle:
How many triangles are there?
Don’t mis-count: there are plenty of triangles & plenty of non-triangles in it!
Another double workshop of triangle-counting riddles
was held in the Mind-games Day of Davidson Institute at the first
day of June. Two lessons of basic triangle counting attracted between
30-40 people of all ages.
We were strolling around in the duty free stores at Istanbul’s Airport.
My eyes caught a very nice example of triangle-counting riddle:
“How many triangles are hiding here?” – I asked.
“Plenty” – she said.
“Correct” – I said.
“I have to count them all…”
But then she showed me her hand…
“It’s only one!” I said.
“Correct” – she said.
A new book is born and available in CreateSpace internet bookstore
and in a week or so it will be available in Amazon channels also.
This book contains most of the riddles in this site arranged in a self-work
method which provides hours of challenging brain teasers for all ages.
The Triangelog is working on the second part which will include new
shapes for all triangle-counters.
A dream comes true!
The first ever workshop of triangle counting riddles
will be held on Thursday 28/5/15 at
This is a part of the Weizmann Institute of Science & each year it
has a special day dedicated for thinking games and brain teasers.
The triangelog will be there!
And now it is a bit more challenging
and even looks better!
So, how many triangles of any size can you find
in this house shape?
The first part of Chen Nirran’s book
How to solve triangle-counting riddles
is available in CreateSpace. Hooray!
the direct link to it is:
When you count triangles it is very important to avoid non-triangles.
It can be easily demonstrated in the first stage of counting the basic shapes.
Look at this Pentagon, for instance:
The inner shape is also a Pentagon.
So, though there are 11 basic shapes
in it, but only 10 of them are triangles.
More than that:
When you stitch the inner Pentagon to
one of the triangles in the second phase
the shape is not a triangle also…
In short: beware!
This Pentagon riddle is solved in the book, of course.
New in this site:
Two easy triangles-counting riddles:
and The Trapeze
How many triangles can you find
in each one of them?
I think you will enjoy to sort & count the number of the triangles in them.
You can start by downloading the pdf-s in the worksheets page, printing etc…
P. S. Don’t forget to write me how many did you find…
After days of sweaty labor there are now 8 easy triangles-counting
riddles and 10 advanced triangles-counting riddles available
and ready to download in “the worksheets” page.
They are colorful and ready for immediate printing and I hope
you will solve them.