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on the day of the 9/11 attack the Pentagon building was also destroyed and left the building in ruins.
Its from the greek word pente (πεντε) meaning five (5). Also the other part of pentagon is greek. It means ''angle''. Pentagon means (a structure) that has five angles.
A pentagon has no right angles at all. Each pentagon has 5 equal sides, which results in internal angles of 108° each. A right angle must be 90°, which is too small to be part of a pentagon.
It was named after a pentagon, it wasn't the 'Pentagon' that named the 'pentagon'.
Hexagon * * * * * A pentagon