Analyze the relationship between angle in a triangle and other polygons Calculate angle Identify and describe Prove the polygon interior measures and solve and angle problems with sum theorems. and exterior angles. Words to Know Fill in this table as you work through the lesson. You may also use the glossary to help you. a polygon in which the extension of at one side concave polygon contains a point the polygon a polygon in which every line segment any two convex polygon points on the polygon contains points outside the polygon