How many triangles are there in the figure ?

18 15 10 20

20

The number of triangles in the given figure is: Trick = 1+ 2+ 3+ 4 = 10   for small trianle , total numbers of triangle is 10  Similarly for large trianle (ABC)  , total numbers of triangle is 10 .    SO, The number of triangles in the given figure is:   10 + 10 = 20