The interior angles of a regular or irregular pentagon always add up to 540 degrees.
So for a regular pentagon, one angle is 108 degrees. 720°
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540 degrees
An irregular pentagon would have the same number of degrees (collective angle degrees) as a regular pentagon. (But, honestly, I don't know the number of degrees in a pentagon right off the top of my head.) Just like how all triangles have a total of 180 degrees and all quadrilaterals have a total of 360 degrees.
The number of degrees in any geometric shape is 180*(n-2) where n is equal to the number of side. Since an octagon has 8 sides, there would be 180*6 or 1080 degrees total in the entire shape.
The total of the interior angles of a pentagon = 540 (in a regular pentagon, each interior angle is 108 degrees). The exterior angles would then be 5*(360-108) = 5*252 = 1260 degrees.
all together 540