Sections Investigating the Number of Diagonals in Polygons Investigating Regular Polygons: Radius, Apothem, and Side Length Investigating Regular Polygons: Radius, Apothem, and Side Length (cont.) Investigating Regular Polygons: Radius, Apothem, and Side Length (cont. II) Investigating the Number of Diagonals in Polygons Investigating Regular Polygons: Radius, Apothem, and Side Length Investigating Regular Polygons: Radius, Apothem, and Side Length (cont.) Investigating Regular Polygons: Radius, Apothem, and Side Length (cont. II) Print Share Developing Algebraic Expressions to Represent Geometric Properties of Polygons Copy and paste the link code above.