+0  
 
+6
64
6
avatar+1118 

How many triangles are in the figure below?

 

 

If you look at it close enough, you will find _____

 

 

Post your answer as an answer!

 Jul 19, 2022
 #2
avatar+2321 
+1

1 x 1 triangles: 3

1 x 2 triangles: 2

1 x 3 triangles: 1

2 x 1 triangles: 3

2 x 2 triangles: 2

2 x 3 triangles: 1

3 x 1 triangles: 3

3 x 2 triangles: 2

3 x 3 triangles: 1 

 

So the sum is \(\color{brown}\boxed{18}\)

 Jul 20, 2022
 #3
avatar+1118 
+5

On my first try I got 16. But then I counted the triangles containing the smaller group!

nerdiest  Jul 20, 2022
 #4
avatar+117766 
+1

6 on top

6 in top section

6 in bigger sections

 

 

that is 18

 Jul 20, 2022
 #5
avatar+370 
-2

18 triangles

 Jul 21, 2022
edited by calvinbun  Jul 21, 2022
 #6
avatar+1118 
+4

That's after everyone posted it...

nerdiest  Jul 21, 2022

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