We can see that there is square that is divided into 4 parts.
Each part is divided into two triangles.
Hence the square is made up of 8 triangles, as labelled below
Now if observe Triangle number 2 and 7 can also form a triangle
Similarly triangle numbers 2 and 3, 3 and 6 and 6 and 7 can also form a triangle.
Hence total number of triangles = 8+4 = 12
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