((2 x 5) - 4) x 90 ie 540o
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The answer depends on what you are summing: the lengths of sides, interior angle, exterior angles.
A pentagon has 5 angles.
Pentagons are 5 sided shapes that have 5 angles and 1of them equal 108 degrees
-- The sum of the four exterior angles is 360 degrees. -- The sum of the four interior angles is also 360 degrees. -- So the sum of all the interior and exterior angles is 720 degrees.
what is the perimeter of a pentegon?