I think it's because Penta means five and a pentagon is 5 sided and the pentagon building when looked from above has 5 sides try wikipedia images
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A pentagon if all sides are equal - if they are not it is called a polygon
A pentagon with 14 sides is called a "contradiction in terms".The definition of a pentagon is: A figure with fivesides.
Because a pentagon has 5 sides
Not a pentagon. Penta = 5
pentagon