How many triangles are there in the following image?
(5+4+3+2+1)*2 + (4+3+2+1)*2 + (3+2+1)*2 - (3) = 30 + 20 + 12 - 3 = 59.
P.S: I am not 100% sure about the answer though. :D
It's around 60
How many triangles are there in the following figure?
