1. What is the sum of the measures of the interior angles of an octagon? 81 . What is the sum of the measures of the interior angles of a 25-gon? 360/ . What is the measure of each interior angle of a regular hexagon? 30 4. What is the measure of each interior angle of a regular 16-gon? 5. What is the sum of the measures of the exterior angles of a decagon? 6. What is the measure of each exterior angle of a regular 30-gon? IDE @009 An exterior angle of a regular polygon measures 22.5. How many sides does it have? 8. An interior angle of a regular polygon measures 170. How many sides does it have?