Find the number of triangles in the given figure.

17 19 21 23

19

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  (ACB) 1+2= 03  (DCB) And, the other triangles are; RSL, VUM, RNC, VPB, COW, QOB, WOD, OQD, ABD, ACD Therefore, there are 03+03+03+10= 19 triangles in the above figure.