How Many Triangles Are in This Picture
We all love a brain teaser — a puzzle that seems simple at first glance but turns out to hide more than meets the eye. This one is no different. Ready to challenge yourself?
Take a look at the image below (or imagine it): multiple overlapping lines, forming triangles in various sizes. The question: How many triangles are there in total?
Got a number in mind? Hold on to it, and don’t sneak a peek just yet.
The Reveal
If you went with 13 triangles, you nailed it — that’s the correct answer, which corresponds to option C in the original post.
How It Adds Up: 13 = 9 + 3 + 1
Here’s how those triangles break down:
| Triangles | How Many | Description |
|---|---|---|
| Small (unit) triangles | 9 | The simplest individual triangles |
| Medium triangles | 3 | Each formed by combining 4 of the small ones |
| Largest triangle | 1 | Encompasses the entire configuration |
Sum them up: 9 + 3 + 1 = 13
Tips for Solving “How Many Triangles” Puzzles
- Start small — count the basic units first (the smallest triangles you can see).
- Look for overlaps — sometimes multiple small triangles combine to form a medium one.
- Think “all at once” — the very largest triangle may use all smaller parts within it.
- Don’t forget hidden ones — some triangles share edges or are partially obscured by lines.
Did you get 13 on your first try? Or did your estimate differ?
You’ve just read, How Many Triangles Are in This Picture. Why not read Manager Had To Hire A New Employee.