How many triangles are there in the given figure?

21 22 19 20

20

The logic followed here is; (let's keep in mind the base, means how many triangles are there in the base) 1+2= 03  (AOC)  1+2= 03  (BOD) 1+2= 03  (ACB) And, the other triangles are; BNM, AOB, ACB, ABD, DNB, CNA, ALN, BNM, ANE, AMB, ALB Therefore, there are 03+03+03+11= 20 triangles in the above figure.