about 61 minutes apart.
The plane collisions were approximately 16 minutes apart.
There were four. Two were flown into the World Trade Center towers, one into the Pentagon, and one crashed into a Pennsylvanian field when a number of the passengers bravely overcame the hijackers and prevented the plane also crashing into another target, probably the White House, and causing a much greater loss of life.
A pentagon has 5 sides.
6in
A pentagon has 5 sides
the pentagon is 1.9 billion dollars to make
A pentagon is a 5 sided polygon
It is free to visit the Pentagon but the tours must be booked in advance. You can request a tour of the building by accessing the Pentagon website and searching for Pentagon tours.
A pentagon need not have any vertical lines. It can have at most two.
The 5 angles in a pentagon add up to 540 degrees
none
six