Can You Figure Out How Many Triangles Are in This Picture?

Doctor ASKY, Facebook
Doctor ASKY, Facebook

Time for another brain teaser. How many triangles do you see here? Doctor ASKY posted the image above for fellow brainiacs to chew on. See if you can figure it out. We’ll wait.

Ready?

So, as you can see, all the smaller triangles can combine to become bigger triangles, which is where the trick lies. If you count up every different triangle formed by the lines, you should get 24. (Don’t forget the big triangle!)

Some pedantic Quora users thought it through and realized there are even more triangles, if you really want to go there. There’s a triangle formed by the “A” in the signature in the right-hand corner, and if we’re counting the concept of triangles, the word “triangle” counts, too.

As math expert Martin Silvertant wrote on Quora, “A triangle is a mathematical idea rather than something real; physical triangles are by definition not geometrically perfect, but approximations of triangles. In other words, both the pictorial triangles and the words referring to triangles are referents to the concept of a triangle.” So yes, you could technically count the word “triangle.” (Silvertant also included a useful graphic explaining how to find all the pictorial triangles.)

Check out the whole Quora discussion for in-depth explainers from users about their methods of figuring it out.

[h/t Doctor ASKY]

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Can You Solve Elon Musk's Favorite Brain Teaser?

Joe Scarnici, Getty Images/Best Events
Joe Scarnici, Getty Images/Best Events

"You're standing on the surface of the Earth. You walk one mile south, one mile west, and one mile north. You end up exactly where you started. Where are you?" This is the question that entrepreneur Elon Musk reportedly likes to ask candidates who interview for positions at SpaceX. The brainteaser was divulged in a 2015 biography about Musk, but it was recently revived when CNBC took to the streets of New York City to see if random passersby could get it right.

Before we reveal the answer below, a bit of background first. Big companies—especially ones in the technology industry—have been known to ask tricky interview questions that read like riddles. In the past, Google interviewees have been asked, "How many people are using Facebook in San Francisco at 2:30 p.m. on a Friday?" Hewlett-Packard has opted for the question, "If Germans were the tallest people in the world, how would you prove it?" And you've probably heard some variation of a question related to golf or tennis balls.

The purpose of these questions it not to make you feel dumb, but to see how you process information and solve complex problems. Interviewers are checking your analytical skills, and whether or not you arrive at the correct answer is almost secondary. But for the fun of it, keep reading to see if you nailed Musk's interview question. Are you ready? The answer is the North Pole. If you follow the directions in the question, you'd make a triangular path and end up back where you started.

There's another possible answer, but it's a little more complicated. The place in question is a circle with a one-mile circumference around the South Pole, and you'd start walking one mile north of it. "You'll walk one mile south to reach this circle, trace that mile-long circle's path, and return one mile north to your starting point," CNBC notes. (If you're having trouble visualizing it, check out this video from Business Insider, which offers a handy illustration.)

If you didn't get it right, don't feel too bad. Most of the New Yorkers who were polled didn't know the answer, either. Fortunately, this question probably won't come up in your average interview.

[h/t CNBC]

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