The building did not collapse becasue of the aircraft strike, it stood for over 30 minutes before the support columns gave way, but only in the E-Ring. All other rings, despite being punctured front and back by the aircraft, remained intact (not by much, but the building did hold).
Evidence of the angle of the strike is in the same photo. Look at the photo and see the obviously burned rooftops running straight down the picture and on the left and right sides. That's the rooftop area of corridors 4 & 5 where the fires burned in between the slate roof tiles and the concrete structure. The 4th corridor is to the left of the picture. The plane struck to the right of 4th corridor and continued on to end up in the open area between the B and C Rings. You can see the top floor burned area of the C-Ring where the aircraft made an exit hole and caused major fires. Count back from the E-Ring to C and then look to the right of the 4th corridor rooftop and you'll see the soot from the fires. That's above the ground floor exit hole the plane made.
I'll see if I can post photos tonight that better detail what I'm trying to describe.
Still a picture is worth a thousand words.
Ever play the block game when you were 3 years old? This fits in here... this doesn't fit in here.
Try this one also: Why would you put gravel and sand over grass that wasn't affected?