The answer is obvious once you take a careful look. However as you can imagine, many persons wont break down the complex view into smaller chunks and solve mathematically.

Lets look at how this is done:

Break up the shape into segments

The easiest way to do this is to identify the base of where each triangle is and split by this. You will notice that the main triangle now has 3 sections: the top, middle and bottom

Notice that the top, there is a main outer triangle, and you can get 5 more triangles from the inside. This makes 6 triangles at the top in total!

Use math to solve the rest

Since there are 3 segments like this, then 3 X 6 = 18. There are a total of 18 triangles that you can find in total.

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