pentagonian triangles

Geometry Level 3

In a pentagon join all of it's vertices with line segments.Now how many triangles are there?

29 35 33 36

Shaan Ragib by shaan ragib , 21, Bangladesh

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1 solution

Patrick Lazo
Mar 7, 2014

Count all triangles.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

There are actually 35 triangles. See the image at the bottom of the following link: http://people.missouristate.edu/lesreid/Sol11_01.html

Jon Haussmann - 7 years, 3 months ago

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I'm surprised too, his answer was just 33 33 .

Ralph Anthony Espos - 7 years, 2 months ago

Thanks. I have updated the answer to 35.

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Calvin Lin Staff - 6 years, 5 months ago

there are 35 in it

Shubhendra Singh - 7 years, 2 months ago

i answered 35 guessing as 35 is multiple of 5

Masud Rana - 7 years, 1 month ago

There are 35 actually!

Anik Mandal - 7 years, 1 month ago

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