How many triangles do you see?

MajesticLion

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It’s 18. There’s a mathematical proof.


I counted 19 the first time because I counted the whole triangle as 1 Unit, then at the end I counted the three tiers again and didn’t realize I’d already counted the largest triangle. :pachaha:

Put it another way, each tier has six triangles and there’s three tiers: the three triangles can form two larger triangles and then all three together form another largest (3+2+1=6); and there’s three tiers, so 6*3=18


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