It has five sides
a pentagon can mean any two dimensional shape with five sides and five angles.
however, as you are enquirig about its location, i think you mean the pentagon which is the headquarters of the united states department of defence, so called because it is shaped like a pentagon.
it is located in arlington county,Virginia
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5
a Pentagon has 5 sides.
A pentagon has no parallel sides.
5 lines
Here is a table for the sum of the interior angles of polygons. No. sides ; Sum 3 ; 180 4 ; 360 5 ; 540 ( The answer to your question). 6 ; 720 7 ; 900 8 ; 1080 9 ; 1260 10 ; 1440 NB Notice for each addition side , add 180.