The words are used in the context of closed shapes. These divide space in two: an inside and an outside. Exterior refers to things that are outside the shape and interior to those that are inside.
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Inside of, and outside of, respectively.
It depends on what you are summing together: the lengths of the sides - to find the perimeter - or the exterior or interior angles - to satisfy a maths question.
If you mean a regular pentagon then each interior angle is 108 degrees and each exterior angle is 72 degrees
A decagon is a 10 sided polygon. Exterior degrees total 360 Interior degrees total 1440
the interior angle is about 128.571428 the exterior angle is about 51.4285