A pentagon is a five sided figure, so you can't really say that a pentogon adds up to anything. The most famous pentagon is The Pentagon in the USA, which is the headquarters for the USA's defence forces.
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540 degrees :)
A pentagon is a 5 sided shape and its 5 interior angles add up to 540 degrees
Interior angles add up to 540 degrees Exterior angles add up to 360 degrees
The sum of the interior angles add up to 540 degrees. The sum of the exterior angles add up to 360 degrees.
Interior angles add up to 540 degrees Exterior angles add up to 360 degrees