This document discusses polygons and methods for determining angle measures in polygons without using a protractor. It defines a polygon as a closed figure formed by line segments that intersect only at endpoints. Polygons are named based on the number of sides and can be regular, meaning all sides and angles are congruent, or irregular. The interior angles of any polygon sum to (n-2)×180°, where n is the number of sides. The exterior angles of any polygon sum to 360°. For a regular polygon, each exterior angle measures 360°/n. Examples are provided to demonstrate using these properties to find sums of interior or exterior angles.