i think 46 triangles.
Total boxes is 16 each box having 2 triangles =16*2=32,
if u see every two box is also becomes triangles
like that every 4 boxes have 2 traingles, =4*2=8,
in centre u see 2 triangles=2,
in sides u see left,right,up,down side 1 triangle=4sides *1=4.
total 32+8+2+4=46 Triangles