Triangleception Part III

Level pending

Count the number of triangles in this figure.


The answer is 35.

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Arpit MIshra by Arpit MIshra , 21, India

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2 solutions

Discussions for this problem are now closed

Roman Frago
Feb 22, 2015

The number of triangles that are formed by joining any 3 corners of the pentagon is 5 C 3 = 10 _5C_3=10 . There are 5 of each colored triangle. Thus, 10 + 5 x 5 = 35 10+5x5=35 .

8 Helpful 0 Interesting 0 Brilliant 0 Confused

This should be a combinatorics problem and not geometry.

Baby Googa - 6 years, 3 months ago

I guess it's geometry pentagon is a part of the geometry.

Frankie Fook - 6 years, 3 months ago

It is geometry but you can use combinatorics to some extent.

Roman Frago - 6 years, 3 months ago

@Roman Frago – yeah lol!You are right :)

Frankie Fook - 6 years, 3 months ago

@Roman Frago – Being jewish. I take offense to your symbol you chose to use

Daniel Harris - 6 years, 3 months ago

@Daniel Harris – Please don't. It'snot the Nazi's swastika...

Roman Frago - 6 years, 3 months ago

@Daniel Harris – Don't take offence, forget all that stuff because it is actually an Asian Symbol, prevalent in South Asia, South East Asia, Eastern Asia and used in four religions, Hinduism, Jainism, Buddhism and Sikhism.

Arpit MIshra - 6 years, 2 months ago
Anna Anant
Feb 27, 2015

focus on one side, find all the triangles and multiply to 5.. I found 7 so my answer is 35 triangles....

2 Helpful 0 Interesting 0 Brilliant 0 Confused

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