Can You Guess How Many Triangles Are in This Viral Photo?

If you’re a fan of brain teasers, you’ll love the latest one sweeping the Internet.

On Monday, journalist Jitesh Pillaai shared a black-and-white drawing of several triangles hidden within one triangle and asked social media users to identify just how many of them they could find.

Say? pic.twitter.com/lrhXrWw5EP

— J (@jiteshpillaai) April 9, 2018

The brain teaser stumped a lot of people, even those good at math, given the limitations of depth perception.

Some, like the famous Bollywood actress Sonam Kapoor, said 7.

7 https://t.co/QV8isDJQQp

— Sonam Kapoor (@sonamakapoor) April 9, 2018

Others 9.

9? 🤔… math is dabba! 🤪😂 https://t.co/b1Cjq527jH

— Aditi Rao Hydari (@aditiraohydari) April 9, 2018

One even claimed to find as many as 24.

Actually, 24. https://t.co/o6qKPRLCa0

— WHERE IS YOUR SCOOTER??? (@commedesjaicon) April 9, 2018

Indian writer Diana Penty said 18, which is the correct answer.

18???!! 🤔 Feels like I haven’t used my brain in a while 🙄 https://t.co/3N4wBNAqAx

— Diana Penty (@DianaPenty) April 9, 2018

If you’re having a hard time figuring out how to arrive at that number, one Twitter user shared a helpful illustration to help solve the puzzler.

18 pic.twitter.com/iNwwyZlA9Z

— Neeraj✍ (@Iam_Ineffable) April 9, 2018

If you figured it out, your geometry teacher would be proud!

For more optical illusions, check out Here’s Why This Woman’s Mind-Bending Mirror Selfie Is Going Viral.

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