The Pentagon construction officially began following a ground breaking ceremony on September 11, 1941. The building was opened on January 15, 1943.
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The huge, 5-sided office building was built between September 11, 1941 and January 15, 1943. The design called for minimal use of steel (a wartime commodity) and was originally intended to be built at a different, roughly pentagonal site.
a pentagon has 5 sides and not the same length
the pentagon is 1.9 billion dollars to make
There are two major definitions of "pentagon". Here is an example using the definition of "Pentagon - major building in the United States that houses many administrative and strategic offices of the United States military". The lieutenant was informed that his CO was currently assigned to duties at the Pentagon. The other major definition is "pentagon - five sided regular polygon". On the geometry test, the students had to identify which shape was a pentagon.
where could you find a pentagon in the real world