For the first problem a.k.a problem #33 I looked it up in downward direction. For each column we can see that there is a triangle that never “moves” (red circle) and thatsthat's our reference point and it follows the clockwise pattern . So we can expect that in the third column there will be a plain triangle at the upper left corner.
The rest is finding the alternating triangle pattern start from the first column and iI guess you can just follow it with few adjustmentadjustments for the rest of the columns.