How many triangles are there in the given figure?

The logic followed here is;

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

1+2= 03  (ARB) 

1+2= 03  (LRM)

1+2= 03  (NRO) 

1+2= 03  (PRO)

1+2= 03  (SVD) 

And, the other triangles are;

DVT, ABD, ACD BRD, SDT

Therefore, there are 03+03+03+03+03+05= 20 triangles in the above figure.