How many triangles are there in the following figure ?

Explanation: The figure given is as;

Clearly, we can examine that there are nine triangles of different sizes inside the outer triangle. Also there are seventeen small triangles inside the big triangle. Therefore, total number of triangles are;

1 + 17 + 9 = 27

Final answer: Hence, we concluded that option(C) is the correct one i.e. 27