To be a regular polygon, a polygon must be _______________________& ________________________ NEW VOCABULARY! Radius of a regular polygon: _____________________________________________________________________ Apothem of a regular polygon: _____________________________________________________________________ Draw a radius and apothem for the following figures in two different colors. Area of an Equilateral Triangle Area of a Regular Polygon: 11.5 – Areas of Regular Polygons 11.5 Notes Deriving New Area Formulas! W X Z Y 60˚ New Area Formula # 2 Area of an Regular Polygon = New Area Formula #1 Area of an Equilateral Triangle =