ReasoningHow many triangles are there in figure given below?

How many triangles are there in figure given below?

No. of triangles

1 Unit:- $1, 2, 3, 5, 8, 11, 12, 10 \to 8$

2 Unit:- $(1, 2) (3, 5) (8, 11) (12, 10) \to 4$

3 Unit:- $(1, 6, 8) (9, 11, 12) (7, 5, 10) (2, 3, 4) \to 4$

6 Unit:- $(1, 6, 9, 12, 11, 8) (2, 4, 3, 5, 7, 10) \to 2$

Total = 18