The figure consists of four repeating parts :
The number of triangles in this part= 4
In the complete figure, this part is repeated four times = 4 x 4 = 16
We extend our study to two parts taken together,
This part contains 2 triangles (highlighted in red and yellow)
4 x 2 = 8 such triangles can be formed
Total number of triangles in the figure = 16 + 8 = 24 | 
