How many triangles are there in the figure ? 

53

Total number of triangles in bigger triangle , 

Trick to calculate number of triangle in bigger triangle  = ( 1+2+3+4 ) × number of horizontal lines 

                                                                               = 10  ×  5 = 50 

number of triangle in smaller triangle = 3 ( by manual counting ) 

Total number of triangle in the given figure = Number of triangles in bigger triangle + number of triangle in smaller triangle 

= 50 + 3