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