Originally published at: https://boingboing.net/2020/01/30/how-many-triangles-do-you-see.html
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4 Likes
I see nine.
18?
I keep thinking I am missing some though.
ETA and now done with the Popular Mechanics article and indeed 18.
Well I thought it was pretty straight forward but when posed as a brain teaser I want to over think it.
ETA More now that I can get to the meme site.
32 Likes
Same here. Almost sure it’s 18.
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Does it still count as a ‘triangle’ if there is a line segment connecting the midpoints of two sides?
Or is that just a trapezoid that shares a side with a triangle?
But, yeah, I get 18.
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18
…
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18, unless the lines on the paper also count, then … lots.
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I SEE all of them…
28 Likes
I got 16 initially, read the comments here, had to go back and figure out which two I had missed, yep 18.
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One large triangle containing lines, and 3 interior triangles within those lines. To find more you have to imagine some lines don’t count as lines.
That’s my contrarian opinion and I’m sticking to it.
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But nobody will agree.
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Yep. The enclosed form’s lines aren’t straight. So, I also see no triangles.
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How many circles do you see here?
I would say “three” but if I’m reading your opinion right, the orange circle is no longer a circle because there’s something inside it. Are you sticking to it?
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36
(and some filler for the comment)
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I get 20 in a somewhat sneaky way:
18 as illustrated in the pop mech solution, Plus two small triangles found in the capital letters A in the question.i
13 Likes
Did you include the horizontal lines which turn each of the other triangles into 3 triangles
Laurel. No, white and gold!
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Looking at the drawn on lines there are 18. I’m getting an additional 30 give or take when you incorporate the ruled lines. So 48 ish
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The answer is actually 20.
Don’t forget to count the capital As.
3 Likes
I also came up with 20
