Exactly how many triangles can you count in this fun triangle puzzle?

A tricky brainteaser has left some Reddit users scratching their heads. In a post uploaded this week, a user posted an image of a diagnal and horizontal line combinatorics. One of the basic problems ...

Add Yahoo as a preferred source to see more of our stories on Google. This triangle brain teaser isn’t new—shoutout to Popsugar for unearthing it a couple years ago—but based on some shady Internet ...