Find the number of triangles in the figure.

Let's count the triangles systematically:
1. Inside the central internal square:
The square is divided into sections by a vertical line, a horizontal line, and diagonal segments.
* Smallest individual single triangles = $4$
* Combined larger triangles (each formed by joining two adjacent small triangles, making up a half-section of the inner square) = $4$
Total triangles inside the central square = $4+4=8$

2. Outer corner triangles:
The inner square is bounded by an outer tilted square (diamond shape), creating four independent triangles at the corners:
* Top corner triangle = $1$
* Bottom corner triangle = $1$
* Left corner triangle = $1$
* Right corner triangle = $1$
Total outer corner triangles = $4$

3. Grand Total:

$$\text{Total number of triangles}=8\text{ (inner)}+4\text{ (outer)}=12$$