How many triangles are there in the given figure?

21 23 19 17

17

The logic followed here is; (let's keep in mind the base, means how many triangles are there in the base) 1+2= 03  (CMD)  1+2= 03  (COD) 1+2= 03  (AOB)  And, the other triangles are; COM, DOM, AOC, BOD, BCA, ABC, ADC, ABD Therefore, there are 03+03+03+08= 17 triangles in the above figure.