A pentagon has 5 angles.
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The answer depends on what you are summing: the lengths of sides, interior angle, exterior angles.
Pentagons are 5 sided shapes that have 5 angles and 1of them equal 108 degrees
((2 x 5) - 4) x 90 ie 540o
what is the perimeter of a pentegon?
A pentagon has no right angles at all. Each pentagon has 5 equal sides, which results in internal angles of 108° each. A right angle must be 90°, which is too small to be part of a pentagon.