How many triangles are there in the figure ?
Answer & explanation
Correct answer: option 4
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