Find the number of triangles in the following figure.

31

The logic followed here is;

(let's keep in mind the base, means how many triangles are there in the base)

1+2= 03  (ALM) 

1+2= 03  (ANS)

1+2= 03  (ABC) 

1+2= 03  (BOX)

1+2= 03  (POR)

And, the other triangles are;

NOP, NOT, SVU, NOB, SQW, NPB AON, AOU, NCB, AOB, UCB, AUB, SQP, NPR, AYW, UPW

Therefore, there are 03+03+03+03+03+16= 31 triangles in the above figure.