a experior angle of a triangle is = to the 2 opposit interior angles of the triangle. If that's not what you are looking for sorry.
Same Side Interior angles are the angle pairs that are on the insides of the two lines (the interior) and on the same side of the transversal
Any value between 0 and 360 degrees (not including those two values).If the polygon were regular, and that is a BIG if, then each interior angle would be 108 degrees.
A pentagon
Pentagons